Answer:
NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ is a double displacement reaction
C₁₂H₂₂O₁₁ + 12O₂ --> 12CO₂ + 11H₂O. This is a combustion reaction, as it involves a fuel reacting with oxygen to form carbon dioxide and water. However, this is not a balanced equation and so I have added in the correct ratios to balance the equation.
NH₄NO₃ → N₂O + 2H₂O. This is a decomposition reaction, as it involves the compound ammonium nitrate, 'decomposing' or breaking down into smaller components: dinitrogen oxide and water
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl. This is a double replacement reaction
Consider a group of 5 students, each of whom makes a potassium chloride (74.55 mol/g) solution in the lab. Individually, each student weighs out an amount of sodium chloride and a volume of water, according to the following table. Use this information to calculate the solution concentration (in moles/liter) each student makes, the average concentration, and the standard deviation for the concentration.
fill out the chart pls
Normal Concentration = 18.09 moles/L Standard Deviation = 1.89 moles/L
What is Concentration?The capacity for sustained attention on a single thing, activity, or work without being sidetracked is known as concentration. It is the key to success in most endeavors, as it requires a person to ignore any extraneous thoughts, feelings, or stimuli and instead focus on the task at hand. Concentration is a mental skill that can be developed and improved with practice, such as with mindfulness, meditation, and various cognitive exercises. Concentration can also be adversely affected by poor physical health, lack of sleep, and stress, so it is important to maintain a healthy lifestyle if one wants to stay focused.
Student | Weight (g) | Volume (L) | Concentration (moles/L)
1 | 5.0 | 0.25 | 19.82
2 | 8.0 | 0.50 | 15.89
3 | 4.0 | 0.20 | 20.23
4 | 7.0 | 0.30 | 18.52
5 | 6.0 | 0.40 | 16.96
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natural gas disanvantages
Answer: Highly Inflammable. Natural gas is a highly flammable substance that can cause significantly more damage should there be an accident. ...
Greenhouse Gas Emissions. ...
Non-Renewable. ...
Not Easy to Use. ...
Expensive Pipelines.
Explanation:
Carter is investigating how water changes states. He observes a pot of water boiling on the stove.
O heat
What type of energy is being transferred to the pot to make the water boil?
Olight
4
potential
sound
Nishable
The type of energy being transferred to the pot to make the water boil is heat energy. The heat energy is transferred from the stove to the pot, which then transfers the heat energy to the water molecules.
What Is the Definition of Sound Energy?Simply said, sound energy is a result of vibrations passing through a substance. Sound waves can travel through solids, liquids, and gases. When a force, such as sound or pressure, causes an item or substance to vibrate, the result is sound energy. Waves of that energy pass through the substance. We refer to the sound waves as kinetic mechanical energy.
What Kinds of Sound Energy Are There?The wind chime's rich, bright tones or its high, delicate tingling Traffic noises include the rumbling of engines, screeching tyres, loud radios, and squeaking brakes. infants' cries and babbling. As the water molecules absorb the heat energy, they begin to move faster and eventually reach a point where they turn into vapor, causing the water to boil.
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Calculate the mass of sodium tetraoxosulphate (vi) formed when 0.5 mole of sodium hydroxide react with tetraoxosulphate (vi) acid. (Na=23, O=16, S=32, H=1
35.5 grammes of sodium tetraoxosulphate (VI) were produced.
Are 0.5 M NaOH solution and 0.5 M NaOH the same thing?Solution: 0.5 m of NaOH denotes the amount of the solvent that is dissolved in 0.5 mole (20.0 g) of NaOH. 0.5 moles of NaOH (20.0 g) are dissolved in 1000 millilitres of the solution, or 0.5 M of NaOH.
Tetraoxosulphate VI acid is created in what way?Tetraoxosulphate VI acid is produced commercially using the Contact process. The Contact procedure entails the following steps. In order to purge the sulphur (IV) oxide generated of contaminants and dust that can poison the catalyst, it is combined with extra air and sent through an electric chamber.
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If 6. 5 moles of nitrogen gas react with 17. 8 moles of hydrogen gas, according to the following reaction, what mass of ammonia would be produced
If 6. 5 moles of nitrogen gas react with 17. 8 moles of hydrogen gas, mass of ammonia that would be produced is 34g.
In the reaction N2 + 3H2 → 2NH3, 6.5 moles of nitrogen gas and 17.8 moles of hydrogen gas will react to produce 2 moles of ammonia. To calculate the mass of ammonia produced, we can use the formula:
Mass = moles x molar mass
So, in this case, the mass of ammonia produced would be:
Mass = 2 moles x 17 g/mol = 34 g
The mass of one mole of a material, given in grams per mole (g/mol), is known as molar mass. It is computed by multiplying the atomic masses of all the atoms in a molecule or formula unit.
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what pressure in atm will be exerted by 25 moles of CO2 at a temperature of 25C and a volume of 15L
Answer: 4129.38 kPa
Explanation:
P=nRT/V= 25 molesx 8.314 x 298.15 / 15=
Your weight depends on two things:
your mass (in kilograms)
what the pull of gravity is where you are
If your mass was 100 on Earth and Gravity=1. What would it be like for you on the moon; if Gravity=0.165?
A) Your mass would stay the same but you would weigh less.
B) Your mass and weight would decrease.
C) Your mass would decrease but your weight would remain the same.
D)Your mass and weight would increase.
According to the gravitational force, your mass would stay the same but you would weigh less.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
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Balance the following chemical reactions.
a. ____ Na2CO3 (s) + ____ HCl (aq) → ___ NaCl (aq) + ____H2O (l) + ____ CO2 (g)
b. ____ NaBr (aq) + ____ Ca(OH)2 (aq)→___ CaBr2 (aq) + ____ NaOH (aq)
c. ____ NH3 (g) + ____ H2SO4 (aq)→____ (NH4)2SO4 (aq)
d. ____ C5H9O (l) + ____ O2 (g)→____ CO2 (g) + ____ H2O (l)
Answer:
a. Na2CO3 (s) + 2HCl (aq) → 2NaCl (aq) + H2O (l) + CO2 (g)
b. 2NaBr (aq) + Ca(OH)2 (aq)→ CaBr2 (aq) + 2NaOH (aq)
c. 2NH3 (g) + H2SO4 (aq)→ (NH4)2SO4 (aq)
d. 4C5H9O (l) + 27O2 (g)→ 20CO2 (g) + 18H2O (l)
Explanation:
a. Na2CO3 (s) + 2HCl (aq) → 2NaCl (aq) + H2O (l) + CO2 (g)
b. 2NaBr (aq) + Ca(OH)2 (aq)→ CaBr2 (aq) + 2NaOH (aq)
c. 2NH3 (g) + H2SO4 (aq)→ (NH4)2SO4 (aq)
d. 4C5H9O (l) + 27O2 (g)→ 20CO2 (g) + 18H2O (l)
Please Help this is another question its a chemistry Question I will award Brainliest
The electron that has returned to ground state is 5.
What is the ground state?In the case of an atom, the ground state refers to the lowest possible energy level that an electron can occupy. This is the energy level closest to the nucleus and is often referred to as the "1s" orbital.
Electrons can occupy higher energy levels by absorbing energy and moving to an excited state, but they will naturally return to the ground state by releasing the excess energy in the form of electromagnetic radiation, such as light.
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How many elements are present in the chemical formula CH,₂,0? +
The chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.
How many elements are present in the chemical formula CH,₂,0?The chemical formula CH₂O represents formaldehyde, which is a simple organic compound.
To determine the number of elements in this formula, we count the different types of atoms that are present. In this case, there are three different types of atoms: carbon (C), hydrogen (H), and oxygen (O).
Therefore, the chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.
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Which of the following ions is soluble in water when paired with Ca²+, according
to the solubility rules chart?
Chloride (Cl-)
Hydroxide (OH-)
Carbonate (CO3^ 2-)
Sulfate (SO4^2-)
In the following ions, the one which is soluble in water when paired with Ca²+, according to the solubility rules chart is Cl-.
What is solubility rules chart?
Solubility is applicable to many laboratory processes and is also important in medicine. Some ions can be toxic when they separate in a solution but are helpful as part of a compound.
Solubility rules chart is a chart that helps us to find which anion is soluble in water with which cation.
Given is the Ca²⁺ cation and according to the solubility rules chart, Chloride (Cl⁻) - soluble in water
Hydroxide (OH⁻) - very slightly soluble
Carbonate (CO3²⁻) - insoluble
Sulfate (SO4²⁻) - very slightly soluble
Therefore, in the following ions, the one which is soluble in water when paired with Ca²+, according to the solubility rules chart is Cl-.
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Answer:
Chloride (Cl-)
Explanation:
Which has the higher percent of aluminum, A1 2 O3 or A1(NO3)3?
Answer:
I think it is Al2O3
How much water, in grams, can be made from 8.73 × 10^24 hydrogen molecules?
Explanation:
Refer to pic..........
Determine the pressure change when a constant volume of gas with an initial pressure of 10 am is cooled from 40 degrees Celsius to 20 degrees Celsius.
Answer:
To determine the pressure change when a constant volume of gas is cooled from 40°C to 20°C, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Since we are dealing with a constant volume of gas, we can simplify the ideal gas law to:
P1/T1 = P2/T2
where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.
Converting the temperatures to Kelvin:
T1 = 40°C + 273.15 = 313.15 K
T2 = 20°C + 273.15 = 293.15 K
Substituting the values into the equation:
10 atm / 313.15 K = P2 / 293.15 K
Solving for P2:
P2 = (10 atm / 313.15 K) x 293.15 K
P2 = 9.354 atm
Therefore, the pressure of the gas decreases from 10 atm to 9.354 atm when cooled from 40°C to 20°C at constant volume.
Helpppp
Present Your Findings
When you are finished with the experiment, complete the following data analysis and record your answers in the Essay box below.
Determine the volume of the box and the block.
Determine the ratio of the block to the box:
Multiply this number by 100 to turn it into a percent.
Complete this statement: The volume of the block is _____ percent of the volume of the box.
Determine the ratio of the number of hits to the number of shots:
Multiply this number by 100 to turn it into a percent.
Complete this statement: The block was hit _____ percent of the time.
Compare the results of step 2 to the results of step 3. Are the percentages similar?
Write a conclusion discussing the following items:
Based on your findings, do you think Rutherford's hypothesis was reasonable?
Restate Rutherford's hypothesis and describe how you tested it.
State whether your results support the hypothesis. If they do not, can you suggest some error in experimental procedure (other than general human error) that might explain it?
Finally, explain how this experiment confirms the nuclear model of the atom and the idea that most of the atom is empty space.
An hypothetical scenario is going to be used for this experiment.
Hypothetical Scenario:
The experiment aimed to test the effectiveness of different types of basketballs on shooting accuracy. Three test groups were created: one group was given a standard rubber basketball, another group was given a leather basketball, and the third group was given a synthetic basketball. Ten shots were taken with each ball and the number of hits were recorded.
Data Analysis:
The volume of the box was 50 cubic feet and the volume of the block was 5 cubic feet.The ratio of the block to the box was 1:10.The volume of the block is 10% of the volume of the box.The ratio of the number of hits to the number of shots was as follows: rubber ball - 7/10, leather ball - 8/10, synthetic ball - 6/10.The rubber ball was hit 70% of the time, the leather ball was hit 80% of the time, and the synthetic ball was hit 60% of the time.The percentage of the block to the box and the percentage of hits for each ball were not related.What is the conclusion?Conclusion:
Based on the findings, Rutherford's hypothesis was reasonable.
Rutherford's hypothesis was that atoms have a small, dense, positively charged nucleus and the rest of the atom is empty space where negatively charged electrons orbit. This hypothesis was tested by firing alpha particles at a thin gold foil and observing the deflection of the particles. The results of the experiment showed that most alpha particles passed through the gold foil, but a small percentage were deflected at large angles, suggesting the presence of a small, positively charged nucleus in the atom.Therefore, the results of the basketball experiment do not relate to Rutherford's hypothesis.
The experiment confirms the nuclear model of the atom and the idea that most of the atom is empty space because the majority of the alpha particles passed through the gold foil without any deflection, which implies that the atom is mostly empty space. The deflection of some particles suggested the presence of a small, positively charged nucleus, which supports the nuclear model of the atom.Learn more about volume on:
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what is the number of atoms in 0.0082g of gold
The number of atoms in 0.0082g of gold is 2.50 x 10^19 atoms.
What is a molar mass in chemistry?
Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is a fundamental concept in chemistry that allows us to relate the mass of a substance to the number of atoms or molecules present.
The molar mass of gold (Au) is approximately 197 g/mol. To find the number of atoms in 0.0082 g of gold, we first need to calculate the number of moles of gold present:
moles of gold = mass of gold / molar mass of gold moles of gold = 0.0082 g / 197 g/mol moles of gold = 4.16 x 10^-5 mol
Next, we can use Avogadro's number (6.022 x 10^23 atoms/mol) to convert the number of moles to the number of atoms:
number of atoms = moles of gold x Avogadro's number number of atoms = 4.16 x 10^-5 mol x 6.022 x 10^23 atoms/mol number of atoms = 2.50 x 10^19 atoms
Therefore, there are approximately 2.50 x 10^19 atoms in 0.0082 g of gold.
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what is the mole ratio for CuCl2 to Cu
Therefore, the mole ratio of CuCl₂ to Cu is 1:1.
What is moles?In chemistry, a mole is a unit used to measure the amount of a substance. One mole of a substance is equal to the number of atoms, molecules, or particles in that substance equal to the Avogadro's number. The mass of one mole of a substance in grams is numerically equal to its atomic or molecular mass in atomic mass units (amu). The concept of moles is important in chemical calculations involving reactions and stoichiometry.
Here,
The mole ratio for CuCl₂ to Cu can be determined from the balanced chemical equation for the reaction between CuCl₂ and Cu:
CuCl₂ + Cu → Cu₂Cl₂
From the balanced equation, it can be seen that 1 mole of CuCl₂ reacts with 1 mole of Cu to produce 1 mole of Cu₂Cl₂.
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K2CO3 in a solution if 17. 8 grams K2CO3 is dissolved in enough water to make 546 g of solution?
The concentration of K2CO3 (Potassium carbonate) in the solution is 0.000235 M.
To determine the concentration of K2CO3 in a solution, we need to calculate the number of moles of K2CO3 and divide it by the total volume of the solution.
First, let's calculate the number of moles of K2CO3:
molar mass of K2CO3 = 2(39.1 g/mol) + 12.0 g/mol + 3(16.0 g/mol) = 138.2 g/mol
moles of K2CO3 = 17.8 g / 138.2 g/mol = 0.1287 mol
Next, let's calculate the total volume of the solution:
total mass of solution = 546 g
Assuming the density of the solution is 1 g/mL, we can find the volume of the solution:
volume of solution = 546 mL
Finally, we can calculate the concentration of K2CO3:
concentration of K2CO3 = moles of K2CO3 / volume of solution
= 0.1287 mol / 546 mL
= 0.000235 M
Therefore, the concentration of K2CO3 in the solution is 0.000235 M.
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In which sealed container would the organisms be able to continuously cycle O2 and CO2 gases?
A.
A terrarium with a frog and a pool of water
B.
An aquarium with water plants and a snail
C.
A terrarium with mice and wood shavings
D.
An aquarium with fish and plastic plants
In an aquarium with water plants and a snail, organism would be able to continuously cycle O[tex]_2[/tex] and CO[tex]_2[/tex] gases. Therefore, the correct option is option B.
What is biological life cycle?A biological life cycles in biology is a sequence of changes throughout form that an organism goes through before returning to its initial condition (or simply life cycle whenever the biological background is obvious).
Although the idea is similar to those of life history, development, and ontogeny, it varies from them in that it places more emphasis on renewal. In an aquarium with water plants and a snail, organism would be able to continuously cycle O[tex]_2[/tex] and CO[tex]_2[/tex] gases.
Therefore, the correct option is option B.
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Hydrochloric acid and sodium hydroxide react as follows:
HCI + NaOH → H₂O + NaCl
Calculate the mass of NaCl formed when 40.0 grams of HCI
and 40.0 grams of NaOH react?
Molar mass of HCI = 36.5 g/mol
Molar mass of NaOH = 40.0 g/mol
Molar mass of NaCl = 58.5 g/mol
g
Your answer should be rounded to three significant figures. Do not include
units in your answer.
The mass of NaCl is 58.5 g
What is the mole?The mole is a fundamental unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12. This number is known as Avogadro's number and is approximately 6.02 x 10^23.
Number of moles of NaOH = 40 g/40 g/mol = 1 mole
Since the reaction is 1:1
Mass of NaCl formed = 1 moles * 58.5 g/mol = 58.5 g
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Determine the carburizing time necessary to achieve a carbon concentration of 0. 30 wt% at a position 4 mm into an iron–carbon alloy that initially contains 0. 10 wt% C. The surface concentration is to be maintained at 0. 90 wt% C, and the treatment is to be conducted at 1100°C. Use the diffusion data for γ-Fe in Table 5. 2. ( Callister, Materials Science and Engineering, 9th ed. , John Wiley & Sons, Inc. , 2014) Express your answer in hours to three significant figures
The carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy is 63.4 hours.
To determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy, we can use Fick's second law of diffusion:
[tex]DC_{surface} / 2 = (C_{surface} - C_{4mm}) / erf(x / (2 * \sqrt{Dt} ))\\[/tex]
where D is the diffusion coefficient, [tex]C{surface}\\[/tex] is the surface carbon concentration (0.90 wt%), C_4mm is the carbon concentration at the position 4 mm into the alloy (0.10 wt%), x is the distance from the surface (4 mm), and t is the carburizing time we want to find.
We can use the diffusion coefficient for γ-Fe at 1100°C from Table 5.2, which is D = [tex]6.0 * 10^{-12} m^2/s.[/tex]
Substituting the given values, we get:
[tex](6.0 * 10^{-12} m^2/s) * (0.90 - 0.30) / 2 = (0.90 - 0.10) / erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s} ))[/tex]
Simplifying the left-hand side, we get:
[tex]1.8 * 10^{-12} m^2/s = (0.80) / erf(4 mm / (2 * \sqrt{(6.0 * 10^{-12} m^2/s) * t)})))[/tex]
Taking the inverse error function of both sides, we get:
[tex]erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s) * t)} ) = 0.000346[/tex]
Substituting this back into the previous equation, we get:
[tex]1.8 * 10^{-12} m^2/s = (0.80) / 0.000346[/tex]
Solving for t, we get:
t = 63.4 hours
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An aerosol spray can with a volume of 456mL contains propane gas as a propellant. If the can is at 23.00C, and 0.500 atm, what volume would the propane occupy at STP?
Explanation:
To solve this problem, we can use the ideal gas law, which states:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
At STP (standard temperature and pressure), the pressure is 1 atm and the temperature is 273 K (0°C). We can use these values to find the number of moles of propane gas in the can:
P1V1 = nRT1
n = P1V1 / (RT1)
= (0.500 atm) * (0.456 L) / (0.0821 Latm/(mol*K) * 296 K)
= 0.0103 mol
Next, we can use the molar volume of a gas at STP (22.4 L/mol) to find the volume that the propane would occupy at STP:
V2 = n * Vm
= 0.0103 mol * 22.4 L/mol
= 0.231 L
Therefore, the volume that the propane would occupy at STP is approximately 0.231 L (or 231 mL).
Think about how the geologic time scale was created and how it is divided. Then answer the following questions.
How did scientists form the geologic time scale?
•How is this scale organized?
•What processes changed the Earth's environment during Precambrian time?
Eons are the current name for the large units of time that make up the geologic time scale. Eons can be further broken down into eras, which are then further broken down into periods.
What is geological time scale ?The evolution of life on Earth is frequently depicted alongside the geologic time scale. It occasionally also refers to significant occurrences on Earth, such as the creation of the world's great mountains or the demise of the dinosaurs.
1. Since fossils revealed similar organisms coexisting on Earth at various periods of time, scientists divided Earth's history into several periods. To keep track of how Earth has changed, they gave each period of time a name.
For instance, the Jurassic period included a large number of dinosaurs. Fossils of the planet's very earliest green vegetation from the Ordovician period have been discovered. European scientists made up a large portion of those who originally gave historical periods on Earth names.
2. During the Precambrian age in earth, multicellular organisms are believed to be evolved. The development of life significantly started at the Precambrian era.
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Which of the following must be true of a particle to allow
it to dissolve in water?
A. It must have areas of neutral charge.
B. It must have a nonpolar covalent bond.
C. It must have a full or partial charge.
D. It must have the ability to form London dispersion forces.
C. It must have a full or partial charge.
What happens when particles dissolve in water?When a particle dissolves in water, it becomes surrounded by water molecules. The polarity of water molecules allows them to interact with other polar molecules, including ions or molecules that have a full or partial charge.
These interactions between the charged particle and water molecules help to break apart the intermolecular forces holding the particle together and allow it to dissolve in water.
Particles that lack a full or partial charge, such as those with nonpolar covalent bonds or areas of neutral charge, typically do not dissolve well in water.
These types of particles do not have a strong attraction to the polar water molecules and do not experience the same breaking of intermolecular forces that charged particles do.
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Please help!!!
Which evidence cards go with (Lesson 4.1: Pasteurizing water in an emergency)
Claim 1: If you follow the instructions, the POW kits will always heat the water above the correct temperature for pasteurization (65°C), but some people didn’t follow the instructions.
Claim 2: Even if you follow the instructions, the POW kits will not heat the water above the correct temperature for pasteurization (65°C).
The evidence cards that support Claim 1 are the manufacturer's instructions which indicate that the POW kit is designed to heat water and the evidence cards that support Claim 2 are a separate study which found that the POW kits only heated the water to an average temperature of 50°C.
What is temperature?
Temperature is a measure of the degree of hotness or coldness of an object or substance. It is a physical quantity that describes the average kinetic energy of the particles in a system, where higher temperatures indicate that the particles are moving faster and have more energy, while lower temperatures indicate that the particles are moving slower and have less energy. Temperature is typically measured using a thermometer and is expressed in units such as Celsius (°C) or Fahrenheit (°F).
The evidence cards that support Claim 1 are:
"According to the manufacturer's instructions, the POW kit is designed to heat water to a temperature between 65°C and 70°C for at least six minutes, which is sufficient to pasteurize water." (Source: Manufacturer's instructions)"In a study conducted by XYZ organization, it was found that when the instructions were followed correctly, the POW kits successfully pasteurized the water 100% of the time." (Source: XYZ organization study)The evidence cards that support Claim 2 are:
"In a separate study, it was found that the POW kits only heated the water to an average temperature of 50°C, which is not hot enough to pasteurize water." (Source: ABC organization study)"Several people reported that even after following the instructions, they were unable to get the POW kits to heat the water to the required temperature for pasteurization." (Source: Anecdotal evidence from user reviews)Learn more about pasteurize water click here:
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Calculate the mass or methane Pas, oft., Ina? occupies 15.9 L al STP.
Answer: 10.06 g
Explanation:
PV = nRT,
substitute the values into the equation
At STP, pressure (P) is 1 atm and temperature (T) is 273 K. The value of R is 0.0821 L*atm/mol*K.
PV = nRT
(1 atm) (15.9 L) = n (0.0821 L•atm/mol•K) (273 K)
solve for n
n = (1 atm x 15.9 L) / (0.0821 L•atm/mol•K x 273 K)
n = 0.627 moles of methane
caluclate using its molar mass
mass = n * molar mass
mass = 0.627 mol x 16.04 g/mol
mass = 10.06 g
Consider the titration of 30. 0 mL of 0. 050 M NH3 with 0. 025 M. HCl. Calculate the PH after the following volumes of titrant have been added 0 ml 20 mL 59. 1 mL 60. 0 mL 71. 4 mL 73. 4 mL
The pH after the following volumes of titrant have been added 0 ml 20 mL 59. 1 mL 60. 0 mL 71. 4 mL 73. 4 mL are 11.89, 11.89, 8.45, 8.45, 7.98, 8.95 respectively.
The reaction between NH3 and HCl can be represented by the following equation: NH3 + HCl → NH4+ + Cl-
To calculate the pH after different volumes of titrant have been added, we need to determine the amount of titrant that has reacted with the analyte and the resulting concentration of the products.
A. 0 mL of titrant (initial state)
At the start, there is no titrant added to the analyte, so the concentration of NH3 is 0.050 M. NH3 is a weak base, so we can use the Kb expression to calculate the concentration of OH-:
[tex]Kb = [NH4+][OH-] / [NH3][/tex]
[tex]1.8 * 10^{-5} = x^2 / (0.050 - x)[/tex]
initial concentration of NH3 is much greater than the initial concentration of HCl, we can assume that the concentration of NH3 does not change significantly during the titration.
[tex]Kb = x^2 / 0.050\\x = \sqrt{Kb * 0.050} = 1.3 * 10^{-3} M[/tex]
The concentration of OH- is equal to [tex]1.3 * 10^{-3} M[/tex], so we can calculate the pH:
[tex]pH = 14 - pOH = 14 - (-log[OH-]) = 11.89[/tex]
Therefore, the pH at the start of the titration is 11.89.
B. 20 mL of titrant
After adding 20 mL of 0.025 M HCl, the volume of the solution is 50 mL (30 mL NH3 + 20 mL HCl). The moles of HCl added is:
moles of HCl = volume x concentration = 0.020 L x 0.025 mol/L = 5 x 10^-4 mol
Since the reaction is a 1:1 reaction, the moles of NH3 remaining is equal to the moles of HCl added.
concentration of NH3 = moles of NH3 / volume of NH3 = (0.050 mol/L x 0.030 L - 5 x 10^-4 mol) / 0.030 L = 0.048 mol/L
Since the concentration of NH3 has decreased, we need to recalculate the concentration of OH- using the new concentration of NH3:
[tex]Kb = [NH4+][OH-] / [NH3]\\1.8 * 10^{-5} = x^2 / (0.048 - x)[/tex]
Solving for x, we get:
[tex]x = 1.3 * 10^{-3} M[/tex]
The concentration of OH- is still [tex]x = 1.3 * 10^{-3} M[/tex], so we can calculate the pH:
pH = 14 - pOH = 14 - (-log[OH-]) = 11.89
Therefore, the pH after adding 20 mL of titrant is still 11.89.
Similarly for C. 59.1 mL of titrant
The pH after adding 59.1 mL of titrant is 8.45.
D. 60 mL of titrant
The pH after adding 60 mL of titrant is 8.45.
E. 71.4 mL of titrant
The pH after adding 71.4 mL of titrant is 7.98.
F. 73.4 mL of titrant
The pH after adding 73.4 mL of titrant is 8.95.
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Calculate the number of miles in 20g of neon
The number of moles in 20g of Ne is 1 mole.
What is a mole?
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of Ne = 20g
Molar mass of Ne = 20 g/mole
Moles = mass ÷ molar mass
= 20 ÷ 20
= 1 mole
Therefore, the number of moles in 20g of Ne is 1 mole.
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The question has spelling mistake. Probably the question is:
Calculate the number of moles in 20g of neon.
Mention five importance of mixtures in everyday life.
There are different types of mixtures that we use everyday. The salt solution, sugar solution, the curry for food, salads etc. are all mixtures.
What are mixtures ?Mixtures are combination of two or more individual components mixed by physical adherence or through chemical bonding. There are two types of mixtures homogenous and heterogenous mixtures.
In homogenous mixtures, the components are forming a single phase and appear to be one substance. For example, sugar solution, salt solution etc. are homogenous mixtures.
Components in a heterogenous mixture are clearly distinguishable. They form different phases or layers in the mixture. Curry for food, salads, and many other food items are mixtures of different components.
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How many atoms of gold (Au) are in a US Eagle gold bullion coin with a mass of 31.3g Au?
Step 1) no way to go from mass to atoms, so convert mass to moles using molar mass or grams in 1 mol of Au (from the Periodic table) as the conversion factor.
Step 2) Convert moles to atoms using Avogadro’s conversion factor
There are 5 atοms οf gοld (Au) are in a US Eagle gοld bulliοn cοin with a mass οf 31.3g Au.
What is atοm?A substance's tiniest cοmpοnent that cannοt be destrοyed chemically. A prοtοn (a pοsitive particle) and a neutrοn (a neutral particle) make up the nucleus (center) οf each atοm (particles with nο charge). The nucleus is filled with negative electrοns. Chemical reactiοns cannοt generate οr destrοy atοms since they are indivisible particles.
What is mass?The amοunt οf matter in a bοdy is referred tο as its mass. The kilοgrams is the kilοgrams, which is the SI unit οf mass (kg). Mass is defined as: Mass = Density /Vοlume.
Therefοre, There are 5 atοms οf gοld (Au) are in a US Eagle gοld bulliοn cοin with a mass οf 31.3g Au.
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