Please help!!!
Multi-Step Problems
1. How many liters would be taken up by 2.50 g of helium?
2. How many grams are in 5.0 x 10^25atoms of sodium?
3. How many atoms are in 3.95 grams of Ni?
4. How many atoms are in a 15 kg sample of XE gas?
5. How many liters would be taken up by 45,000,000 atoms of Ar?
6. How many atoms are in a 75g sample of CO₂?
Answers
2.50 g of helium gas at STP would occupy a volume of 14.0 liters.
What is STP?Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.
1. Helium seems to have a molar mass of 4.00 g/mol.
Therefore, we can calculate the number of moles of helium as:
moles of He = mass of He divided by molar mass of He
= 2.50 g / 4.00 g/mol
= 0.625 mol
Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:
volume of He = moles of He x molar volume of gas at STP
= 0.625 mol x 22.4 L/mol
= 14.0 L
2.50 g of helium gas at STP would occupy a volume of 14.0 liters.
2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:
moles of Na = number of atoms of Na divided by Avogadro's number
= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol
= 83.0 mol
Then, we can use the molar mass of sodium to calculate the mass of sodium:
mass of Na = moles of Na x molar mass of Na
= 83.0 mol x 22.99 g/mol
= 1900 g
Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.
3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:
moles of Ni = mass of Ni divided by molar mass of Ni
= 3.95 g / 58.69 g/mol
= 0.0673 mol
Then, we can use Avogadro's number to calculate the number of atoms of Ni:
number of atoms of Ni = moles of Ni x Avogadro's number
= 0.0673 mol x 6.022 x 10²³ atoms/mol
= 4.05 x 10²² atoms
Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.
4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:
moles of Xe = mass of Xe divided by molar mass of Xe
= 15 kg / 131.29 g/mol
= 114 mol
Then, we can use Avogadro's number to calculate the number of atoms of Xe:
number of atoms of Xe = moles of Xe x Avogadro's number
= 114 mol x 6.022 x 10^23 atoms/mol
= 6.87 x10²⁵ atoms
Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.
5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:
moles of Ar = number of atoms of Ar divided by Avogadro's number
= 45,000,000 atoms / 6.022 x 10²³ atoms/mol
= 7.47 x 10⁻¹⁷ mol
Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:
volume of Ar = moles of Ar x molar volume of gas at STP
= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol
= 1.67 x 10⁻¹⁵ L
Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.
6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:
moles of CO₂ = mass of CO₂ divided by molar mass of CO₂
= 75 g / 44.01 g/mol
= 1.70 mol
Then, we can use Avogadro's number to calculate the number of atoms of CO₂:
number of atoms of CO₂ = moles of CO₂ x Avogadro's number
= 1.70 mol x 6.022 x 10²³ atoms/mol
= 1.02 x 10²⁴ atoms
Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.
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Related Questions
What percent is Cu of CuCo3 is copper?
Answers
Answer: As an example, we can decompose copper carbonate into its constituent elements, copper, oxygen, and carbon, weighing each and taking the ratios of these masses. The result is that every sample of copper carbonate is 51.5% copper, 38.8% oxygen, and 9.7% carbon.
Explanation:
3RD TIME TRYING CHEMISTRY QUESTION, PLEASE HELP
I've tried this question already but I didn't get the full answer. If you could help with all of them, that would be great <3
If Reaction B was at equilibrium and then was heated ______ CH3OH would be present after the reaction adjusts to the new temperature.
- more
- less
- the same amount of
If Reaction B was at equilibrium and then H2 was added, _____ CH3OH would be present after the reaction adjusts.
- more
- less
- the same amount of
If Reaction B was at equilibrium and then H2 was added, _____ CO would be present after the reaction adjusts.
- more
- less
- the same amount of
Answers
The effect of change of pressure, concentration and temperature on the state of equilibrium can be predicted with the help of Le Chatelier's principle.
What is Le Chatelier's principle?If a system in equilibrium is subjected to a change in concentration, pressure or temperature, the equilibrium shifts in the direction that tends to reduce the effect of the change.
According to Le Chatelier's principle, the increase of temperature will shift the equilibrium in the direction of endothermic reaction. Here the forward reaction is exothermic, so more amount of CH₃OH will be produced.
If H₂ is added, more amount of CH₃OH will be produced and less amount of CO will be present.
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Now write the formulas of TWO compounds we can investigate--one that has an
element substituted for H, and one that has an element substitute for O. Write the
formulas separate by a comma, like this: X20, H2X
Answers
The term chemical formula is also called the molecular formula of a compound which represents the total number of atoms of each constituent elements present in one molecule of the compound.
What is chemical formula?The chemical formula is defined as the symbolic representation which gives the chemical composition of a compound. They also denotes the ratios in which the constituent elements combine to form the compound.
The chemical formula of a compounds with an element hydrogen are HCl, NH₃, HNO₃, etc. whereas the chemical formula of the compounds with an element 'O' are H₂O, H₂O₂, OH⁻, etc.
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Answer the following questions thoroughly.
1. The atmosphere is composed of four different layers: the troposphere, the
stratosphere, the mesosphere, and the thermosphere. (12 points)
A. What are the temperatures (cold, warm, or hot) found in each layer of the
atmosphere? (8 points)
B. Where is the ozone layer and what is its function? (2 points)
C. Where is the ionosphere and what is its function? (2 points)
Answers
1) The troposphere is cool while the stratosphere, mesosphere and the thermosphere are hot.
2) The ozone layer is in the stratosphere
3) The ionosphere is in the thermosphere.
What are the layers of the atmosphere?This is the lowest layer of the atmosphere, extending from the Earth's surface up to about 7-20 kilometers (4-12 miles) depending on the location. This is where weather occurs, and it is where we live and breathe. Temperature decreases with height in the troposphere.
The thermosphere is the fourth layer of the atmosphere, extending from about 85-600 kilometers (53-373 miles) above the Earth's surface. This layer is characterized by high temperatures due to absorption of solar radiation, and it is also where the auroras occur.
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How many grams of ammonia are produced from 80.0 liters of hydrogen. ILL GIVE BRAINLIST!!!
Answers
80.0 liters of hydrogen gas at STP can produce 37.1 grams of ammonia.
What is the mass of ammonia produced?To answer this question, we need to know the balanced chemical equation for the reaction between hydrogen and ammonia:
N2 + 3H2 → 2NH3
From this equation, we can see that 3 moles of hydrogen are required to produce 2 moles of ammonia.
Now, we need to convert 80.0 liters of hydrogen to moles. We can use the ideal gas law to do this:
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.Assuming standard temperature and pressure (STP), which is 0°C (273 K) and 1 atm, respectively, we can use the following values:
P = 1 atmV = 80.0 LT = 273 KR = 0.08206 L·atm/mol·KPlugging these values into the ideal gas law, we get:
n = PV/RT = (1 atm)(80.0 L)/(0.08206 L·atm/mol·K)(273 K)
n = 3.27 moles of H2
Now, we can use the stoichiometry of the balanced equation to determine the number of moles of NH3 produced:
3 moles of H2 produces 2 moles of NH3
Therefore, 3.27 moles of H2 produces:
(2 moles of NH3 / 3 moles of H2) x 3.27 moles of H2 = 2.18 moles of NH3
Finally, we can use the molar mass of NH3 to convert moles to grams:
2.18 moles of NH3 x 17.03 g/mol = 37.1 g of NH3
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True or false:In order for an electron to go back to the ground state, the atom emits the excess energy in the form of a photon, a particle of light. Each element will produce a unique line spectrum because each element has different energy levels
Answers
The given statement is true. In order for an electron to go back to the ground state, the atom emits the excess energy in the form of a photon.
After absorbing the energy, the electron advances to a higher energy state. In the opposite process, called emission, the electron releases the excess energy it had taken up and goes back to its ground state.
The energy of the electron drops when it changes levels, and the atom releases photons. The emission of the photon occurs as the electron transitions from a higher to a lower energy state. The energy of the photon is precisely the energy that is lost when an electron moves to a level with less energy.
Because each element has a different amount of electrons and hence a diverse range of energy levels, each element's spectra are distinct.
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What is the correct answer please help me
Answers
Chemical bonds involve the interaction between nuclei and electrons. Option D.
Chemical bondsChemical bonds are formed through the interaction between atoms, where electrons in the outermost energy level (valence electrons) are shared, gained or lost between atoms.
This results in the formation of a more stable compound. In these interactions, the positively charged nucleus of each atom attracts the negatively charged electrons of the other atom, creating a bond.
The strength of the bond is determined by the distance between the nuclei and the number of electrons shared between them.
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Consider the following reaction PCL→ PCL3+ CL2 Calculate the amount, in moles of Chlorin that would be produced form 5.10g of phosphorus (v) chloride [P=31, C1=35.5]
Answers
(1 x 31) + (5 x 35.5) = 208 g/mol
To calculate the amount of moles of PCl5 in 5.10 g, we divide the mass by the molar mass:
n = m / M
n = 5.10 g / 208 g/mol
n = 0.0245 mol
According to the balanced chemical equation, 1 mole of PCl5 produces 1 mole of Cl2. Therefore, the amount of moles of Cl2 produced will be equal to the amount of moles of PCl5:
n(Cl2) = n(PCl5) = 0.0245 mol
According to the balanced chemical equation, 1 mole of PCl5 also produces 1 mole of PCl3. Therefore, the amount of moles of PCl3 produced will also be equal to the amount of moles of PCl5:
n(PCl3) = n(PCl5) = 0.0245 mol
Therefore, the amount of moles of Cl2 produced from 5.10 g of PCl5 is 0.0245 moles.
4. Plant cells have large, round vacuoles they primarily use for-
Answers
Plant cells have large, round vacuoles they primarily use for water storage so that will be option A.
A vacuole is a membrane-bound organelle found in plant, fungus, and animal cells, as well as certain protist, animal, and bacterial cells. Vacuoles are simply confined compartments filled with water holding inorganic and organic molecules in solution, including enzymes, while in certain situations they may also include solids that have been absorbed.
Vacuoles are generated by the fusing of several membrane vesicles and are just bigger versions of these. The organelle has no fixed form or size; its structure changes depending on the needs of the cell.
The role and relevance of vacuoles vary substantially depending on the kind of cell in which they are found, with plants, fungi, and some protists having far more prominence than animals and bacteria. In general, the vacuole performs the following functions:
Isolating materials that might be toxic or pose a risk to the cellstoring waste productsWater storage in plant cellsLearn more about Vacuoles:
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Complete question:
Plant cells have large, round vacuoles they primarily use for -
A) water storage
B) energy production.
C) protein synthesis.
D) waster removal
When a person runs, how is
the energy transformed?
A. The chemical energy in their food is
transformed into sound and thermal energy.
B. The mechanical energy in their food is
transformed into electromagnetic and
thermal energy.
C. The chemical energy in their food is
transformed into mechanical and thermal
energy.
Answers
The energy can neither be created nor be destroyed. But it can be converted from one form to another. When a person runs, The chemical energy in their food is transformed into mechanical and thermal energy. The correct option is C.
What is mechanical energy?The mechanical energy of an object is the sum of the potential and kinetic energies which is used to do a particular work. It represents the energy of an object due to its motion or position or both.
The body takes chemical energy in the form of food. when a person runs this chemical energy is utilized by our body and converted into kinetic energy (Mechanical). The body get heated by running which then releases thermal energy.
Thus the correct option is C.
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7.7 g of NaCl and 18.4 g of KBr were dissolved in 40 g of water. What is the mole fraction of NaCI in the solution?
Answers
The mole fraction of NaCI in the solution is 0.079 when 7.7 g of NaCl is dissolved in 40 g of water.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
Number of moles of NaCl =7.7/40=0.1925 and number of moles of water =40/18=2.22 thus mole fraction= 0.1925/2.414=0.079.
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There are 200,000,000,000,000,000,000,000 stars in the universe. How many moles is this? I am starting with the unit _______________ and solving for the unit ________________.
Answers
Answer:
it is 6E23 moles
Explanation:
how does the muscular system work with other body systems
Answers
Answer:
controls involuntary movements of other organ systems
Explanation:
Calculate the mass of hydrogen gas produced when 12 grams of zinc react with excess sulfuric acid.
Answers
The mass of hydrogen gas produced when 12 grams of zinc reacts with excess sulfuric acid is 0.370 g.
What is molar mass?Ratio between the mass and amount of substance (measured in moles) of any sample is called molar mass.
Zn + H2SO4 -> ZnSO4 + H2
Molar mass of zinc is 65.38 g/mol.
moles of zinc is mass of zinc / molar mass of zinc
moles of zinc = 12 g / 65.38 g/mol
moles of zinc = 0.1838 mol
Moles of hydrogen gas is equal to moles of zinc
moles of hydrogen gas = 0.1838 mol
So, mass of hydrogen gas = moles of hydrogen gas x molar mass of hydrogen gas
mass of hydrogen gas = 0.1838 mol x 2.016 g/mol (molar mass of H2)
mass of hydrogen gas = 0.370 g
Therefore, the mass of hydrogen gas produced when 12 grams of zinc reacts with excess sulfuric acid is 0.370 g.
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Two hockey players attempt to move the puck at rest. Each player applies a 10 N force on either side of the puck.
What is the resulting motion of the puck?
The puck will move in the direction of the heaviest player.
The puck will move away from the heaviest player.
The puck will not move because equal forces are acting on it.
The puck will not move due to gravity.
Answers
As a result of friction, kinetic energy is converted into thermal energy, which lowers velocity as a byproduct.
Describe a motion example.Motion is a characteristic of moving objects. Our daily lives involve a lot of motion, a phenomenon. For instance, the vehicle you are currently in moves, as does the universe, the planet, the air we breathe, the blood in our veins, and a host of other things.
Motion changes in what ways?The total force acting on an item determines its motion; if that total force is not zero, the object will move in a different direction. More mass means the object is heavier.
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how much does a 5.0kg puppy weigh on earth
Answers
Answer:
49.05
Explanation:
weight = mass × gravity
49.05 = 5 × 9.81
Answer:
5kg is still 5kg on Earth
In pounds it would be 11.02lbs
Which condition most likely keeps mangrove trees from growing in deserts? Responses The ground is too dry. The ground is too dry. The winds are too strong. The winds are too strong. The air gets too cold at night. The air gets too cold at night. There is too much light during the day.
Answers
The fact that the earth is too dry is what most likely prevents mangrove trees from growing in deserts.
What kind of habitat is ideal for mangrove growth?All of these trees flourish in low-oxygen soil regions with slowly flowing rivers that permit the accumulation of fine sediments. Because mangrove trees cannot withstand subfreezing conditions, they can only be found close to the equator in tropical and subtropical latitudes.
What circumstances lead to the development of mangrove forests?Mangroves are only found close to protected beaches in tropical or subtropical ltiatudes since they are unable to withstand subfreezing temperatures. They all possess the unique capacity to thrive in salted soil that is within the range of the tides.
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1.5 moles of gas are contained in a 5.8 L chamber with a temperature of 294 K. What is the
pressure inside the chamber?
Answers
Answer: 6.04 atm
Explanation:
PV = nRT
plug in the given values and solve for P:
n = 1.5 moles
V = 5.8 L
R = 0.08206 L·atm/(mol·K) (gas constant)
T = 294 K
P = nRT/V
P = (1.5 mol) x (0.08206 L·atm/(mol·K)) x (294 K) / (5.8 L)
P = 6.04 atm
Therefore, the pressure inside the chamber is 6.04 atm
How would I justify if it’s accurate or precision
Answers
a. The measurements on the target do not represent accuracy well.
b. The measurements on the target represent precision fairly well.
What qualifies as accuracy and precision?Accuracy refers to the closeness of a measurement to the true or accepted value. Since they are off target, the measurements are not accurate.
Precision refers to the consistency and reproducibility of measurements, and in this case, the shots are clustered around certain areas, with two points in the second circle and two points in the third circle. This indicates that the person taking the shots was able to consistently hit a certain area.
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As each successive member of the alkene series is considered, the ratio of carbon atoms to hydrogen atoms
A) decreases
B) increases
C) remains the same
Answers
Answer:
B) increases
Explanation:
A student mixed 24.5 g of magnesium bromide with 8.67 x 1022 molecules of hydroiodic acid... They recovered 8.23 g of acid. What is the percent yield?
Answers
Answer:
Explanation:
To calculate the percent yield of a reaction, we need to compare the actual yield (the amount of product obtained in the experiment) with the theoretical yield (the amount of product that should have been obtained based on stoichiometric calculations).
The balanced chemical equation for the reaction between magnesium bromide (MgBr2) and hydroiodic acid (HI) is:
MgBr2 + 2HI → MgI2 + 2HBr
From this equation, we can see that 1 mole of MgBr2 reacts with 2 moles of HI to produce 1 mole of MgI2 and 2 moles of HBr. We can use this information to calculate the theoretical yield of HBr that should have been obtained based on the amount of MgBr2 used:
Calculate the moles of MgBr2 used:
moles of MgBr2 = mass / molar mass = 24.5 g / 184.11 g/mol = 0.133 moles
Use the mole ratio from the balanced equation to calculate the moles of HBr that should have been produced:
moles of HBr = 2 x moles of MgBr2 = 2 x 0.133 moles = 0.266 moles
Calculate the mass of HBr that should have been produced:
mass of HBr = moles of HBr x molar mass = 0.266 moles x 80.91 g/mol = 21.47 g
So the theoretical yield of HBr is 21.47 g.
The actual yield of HBr obtained in the experiment is 8.23 g.
We can now calculate the percent yield as:
percent yield = (actual yield / theoretical yield) x 100%
percent yield = (8.23 g / 21.47 g) x 100%
percent yield = 38.4%
Therefore, the percent yield of the reaction is approximately 38.4%.
What is the problem with changing the force in the rubber band and the mass of the tub at the same time?
Answers
When you apply a force to a rubber band, it changes shape and then returns to its previous shape when you remove the force.
What change would happen to a rubber band when force is applied on it?It is solid in nature, but because to the elastic nature of the rubber band, it may change shape when force is applied. For modest applied forces, the stretching action of rubber bands follows Hooke's Law, F=k x.
The limit of force for which the rubber band obeys Hooke's law is determined by the band's physical parameters, such as cross-sectional area. The stronger the attraction, the longer it lasts. In other words, a greater force causes the rubber band to stretch further.
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What is the mass of 6.45 x 10^25 atoms Cu? The molar mass of Cu is 63.55g/mol.
Chemistry is so difficult for me! If anyone can help I would be SO thankful!
Answers
The mass of 6.45 x 10^25 atoms of Cu is 682.3 grams. For example, the atomic weight of carbon is 12.011, so the molar mass of carbon is 12.011 g/mol.
What is Molar Mass?
Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mole). It is a fundamental concept in chemistry and is used in various calculations, such as determining the mass of a sample of a substance, the number of moles in a sample, or the number of atoms or molecules in a sample.
The molar mass of an element is equal to its atomic weight, which is the weighted average of the masses of all the isotopes of that element, taking into account their relative abundance.
Determine the number of moles of Cu atoms:
6.45 x 10^25 atoms Cu x (1 mole Cu / 6.022 x 10^23 atoms Cu) = 10.73 mol Cu
Use the molar mass of Cu to convert from moles to grams:
10.73 mole Cu x (63.55 g Cu / 1 mole Cu) = 682.3 g Cu
Therefore, the mass of 6.45 x 10^25 atoms of Cu is 682.3 grams.
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A student mixed 24.5 g of magnesium bromide with 8.67 x 1022 molecules of hydroiodic acid... They recovered 8.23 g of acid. What is the percent yield?
Answers
As per the result, the reaction's percent yield is about 38.4%.
What is percent yield?
The % ratio of the actual yield to the theoretical yield is referred to as percent yield. We must compare the actual yield with the theoretical yield in order to determine the percent yield of a reaction.
The balanced chemical equation for the reaction between hydroiodic acid (HI) and magnesium bromide ([tex]MgBr_2[/tex]) is as follows:
[tex]MgI_2 + 2HBr ----- > MgBr_2 + 2HI[/tex]
This equation shows that when 1 mole of[tex]MgBr_2[/tex] is combined with 2 moles of HI, 1 mole of MgI2 and 2 moles of HBr are created. With this knowledge, we can determine the theoretical yield of HBr that ought to have been attained given the quantity of [tex]MgBr_2[/tex] used:
MgBr2 moles are equal to mass/molar mass, which is 24.5 g/184.11 g/mol, or 0.133 moles.
0.266 moles of HBr are equal to 2 moles of [tex]MgBr_2[/tex] multiplied by 0.133 moles.
0.266 moles of HBr times a molar mass of 80.91 g/mol results in 21.47 g of HBr mass.
Hence, 21.47 g is the theoretical yield of HBr.
8.23 g of HBr were really produced during the experiment.
So, we can determine the % yield as follows:
(Actual Yield / Theoretical Yield) x 100% Equals percent yield
percent yield = (8.23 g / 21.47 g) x 100%
percent yield = 38.4%
Thus, the percent yield of the reaction is approximately 38.4%.
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The diagrams show life cycles of two organisms that live near a freshwater ecosystem. Which environmental change will most likely have a negative effect on reproduction in both organisms?
Answers
A change in water temperature is likely to have a negative effect on reproduction in both organisms that live near a freshwater ecosystem.
Since both organisms are adapted to the water temperature of their environment, and any increase or decrease in temperature can cause their reproductive processes to be disrupted. For example, an increase in water temperature can cause an increase in the metabolic rate of the organisms, leading to a decrease in the amount of energy available for reproduction.
Also, an increase in water temperature can cause an increase in water evaporation, leading to a decrease in the amount of water available for the organisms, which can also negatively affect their reproductive processes.
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At what temperature will 65 g of Neon gas (Ne) occupy 12.30 liters at 1256 torr?
Explain the process.
Answers
Answer:
T
=
447
K
≈
174
∘
C
.
Explanation:
This is what we're given:
P
(pressure), which is
1.95 atm
.
V
(volume), which is
12.30 L
.
n
(number of moles), which is
0.654
moles of neon gas.
We have to find
T
, or temperature. To do this, we'll need to use the Ideal Gas Law, which is:
P
V
=
n
R
T
Rearranging this equation to get temperature on one side, we get:
T
=
P
V
n
R
Pressure is in
a
t
m
and volume is in
L
. This tells us that we'll need to use the value of
0.08206 L atm/K mol
for
R
, the ideal gas constant.
Plugging in all of the values, we can solve for temperature:
T
=
p
V
n
R
T
=
1.95
atm
×
12.30
L
0.654
mol
×
0.08206
L
atm
K
−
1
mol
T
=
447
K
We can then convert to celsius, which equals to around
174
∘
C
.
Answer link
Explanation:
What problems might it cause if a company tried to recycle materialswithout sorting them first?
Answers
A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.
Answers
Milk has a pH of roughly 6.60.
What is the formula to determine pH based on the amount of H+?The following equation, pH = log [H+], which refers to the molar hydrogen ion concentration, gives the definition of pH. You'll see that to get pH, we must use the common (base 10) logarithm of the hydrogen ion concentration.
The formula for calculating pH is: pH = -log[H+]
where [H+] is the concentration of hydrogen ions (also known as hydronium ions) in moles per liter.
Given that the [H+] in a liter of milk is about 2.51 × 10–7, we can calculate the pH as follows:
pH = -log(2.51 × 10–7)
pH = -log(2.51) - log(10–7) (using the logarithmic rule that log(ab) = log(a) + log(b))
pH = -0.399 - (-7) (taking the negative logarithm of 2.51)
pH = 6.60
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A sample of butane gas, C4H10, was collected over water at 28.0 °C and 754.4 torr. The wet gas volume is 1.00 L. What will be the volume of dry butane at 824.1 torr and 55.9 °C?
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At 824.1 torr + 55.9°C, dry butane has a of 0.937 L. The basic formula for size is length, breadth, and height, as volume opposed to length, width, and height for the surface of a rectangular shape.
What volume do you refer to?Any three-dimensional solid's volume is the area it takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres. Forms come in a wide range of volumes.
There are three methods for measuring volume.Volumes will be calculated using three different techniques: geometrically (measured lengths); water displace; and pycnometry, to demonstrate the effects of precision on data.
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At 60°c, the ion-product constant of water, kw, is 9. 25 × 10–14. What is the ph of pure water at 60°c ?
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The pH of pure water at 60°C is approximately 7.02, which indicates a neutral solution.
At 60°C, the ion product constant of water,[tex]Kw, is 9.25 × 10^–14.[/tex]
For pure water at this temperature, the concentration of H+ ions is equal to the concentration of OH- ions, so we can write:
[tex]Kw = [H+][OH-] = (x)(x) = x^2[/tex]
where x is the concentration of H+ ions (and also OH- ions) in mol/L.
Taking the square root of both sides, we get:
[tex]x = sqrt(Kw) = sqrt(9.25 × 10^–14) = 9.62 × 10^–8 mol/L[/tex]
Therefore, the pH of pure water at 60°C is:
[tex]pH = -log[H+] = -log(9.62 × 10^–8) = 7.02[/tex]
So the pH of pure water at 60°C is approximately 7.02, which indicates a neutral solution.
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