The total number of the ions in the 3.93 mol of the MgCl₂ is 7.09 × 10²⁴ ions .
The chemical equation is as follows :
MgCl₂ ---> Mg⁺ + 2Cl⁻
The total number of the ions of MgCl₂ = 1 Mg⁺ + 2 Cl⁻
The total number of the ions of MgCl₂ = 3 ions
The number of the moles of the MgCl₂ = 3.93 mol
1 mole of the substance = 6.022 × 10²³ ions
The total number of the moles of substance = 3 × 3.93 × 6.022 × 10²³ ions
The total number of the moles of ions = 7.09 × 10²⁴ ions
Thus, the total number of the ions of the MgCl₂ is 7.09 × 10²⁴ ions .
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Pls I need help urgently. Find the Lewis dot structure for water and ethanol and examine the structures and identify which part is partial negative and partial positive.
Both the hydrogen and oxygen atoms in water have a partial positive and negative charge. Both hydrogen and carbon ions are both somewhat positive in ethanol, while oxygen is partially negative.
Are ethanol and alcohol the same thing?The c (C), oxygen (O), & hydrogen (H) atoms that make up alcohols are combined to form organic molecules. The alcohol is known as ethanol if it contains two carbons (also known as ethyl alcohol). In beverages like beer and wine, alcohol is present in the form of ethanol.
Is alcohol ethanol's fundamental form?An constituent in alcoholic drinks including beer, wine, and brandy, ethanol is also known as alcohol, ethyl alcohol, and grain alcohol. It is a transparent liquid with no color. Ethylene can be hydrated to make ethanol, which is a naturally occurring result of plant fermentation.
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The Lewis dot structures for water (H2O) and ethanol (C2H5OH) are as follows:
Water (H2O):
H
/
H O
\ /
H
Ethanol (C2H5OH):
H H
\ /
C
/
H H
|
O
|
H
In both structures, the oxygen atom has a higher electronegativity than the hydrogen or carbon atoms, meaning it attracts electrons more strongly. As a result, the oxygen atom in both water and ethanol has a partial negative charge (denoted by the symbol δ-), while the hydrogen atoms have a partial positive charge (denoted by the symbol δ+). This polarity arises due to the unequal sharing of electrons between the oxygen and hydrogen atoms, with the oxygen atom attracting the electrons more strongly.
In water, the partial negative charge on the oxygen atom creates a hydrogen bond with the partial positive charge on a neighboring hydrogen atom of a nearby water molecule, resulting in the formation of a network of hydrogen bonds. These hydrogen bonds give water its unique properties, such as high surface tension and high boiling and melting points.
In ethanol, the partial negative charge on the oxygen atom is also responsible for the molecule's polarity. The carbon atom is partially positive due to the electron-withdrawing effect of the oxygen atom, which makes ethanol more soluble in polar solvents such as water. Ethanol can also form hydrogen bonds with water due to the presence of the hydroxyl (OH) group.
why does direction matter please i beg you to help me its in science ill give you brainliest if the answer is right
In science, direction can be important because it can affect the outcome of an experiment.
What is direction?Direction is the process of guiding or instructing someone to a particular destination or goal. It can include giving instructions, leading and pointing out a path to follow, or providing assistance to help a person or group reach a certain destination. Direction can be provided verbally or using visual cues, such as maps or diagrams. It is an essential skill for many professions, such as teaching, management and leadership roles. Direction can also help with problem solving, as it can help to identify the steps needed to reach a desired result.
For example, if you are conducting a test on the effects of wind on a plant, the direction of the wind can have a significant effect on the results of the experiment. If the wind is blowing from the north, it will have a different impact on the plant than if it was blowing from the south. Direction can also be important in physics when looking at the movement of objects, or when understanding the forces that are acting on them.
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Give one which the candle experiment and lavoisier experiment are same and different
Answer:
There are two different effects. Both a chemical and a physical reasoning are needed to explain what we can see. Both physics and chemistry matter. The initial cancellation effect can confuse the observer. Mathematics plays a role when the chemical equations are balanced.
Explanation:
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How many liters are in 0.500 moles of Ar?
The number of litres in 0.500 moles of Argon gas is 11.19L.
How to calculate volume?The number of litres in a substance can be calculated by dividing the mass of the substance by its density.
However, according to this question, there are 0.500 moles of Argon. The mass can be calculated as follows:
mass = no of moles × molar mass
mass = 0.5 mol × 39.948 u
mass = 19.97g
The density of argon gas at STP is 1.7857 g/L.
Volume = 19.97g ÷ 1.7857g/L
Volume = 11.19L
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In osmosis, if a membrane separates two solutions, liquid will tend to move from
the side with the stronger solution to the side with the weaker solution. A tea bag
is placed inside a cup of hot water. Which best describes the process of osmosis
in this situation?
1.Osmosis does not occur because the hot water is the only solution.
2.The water, having a stronger concentration, moves inside the tea bag.
3.The water near the tea leaves, having a stronger concentration of tea,
moves outside the tea bag.
4.The tea leaves, having a weaker concentration, release their juices
into the water.
Answer:
2.The water, having a stronger concentration, moves inside the tea bag.
Explanation:
This is a form of osmosis called hypotonic, in which a solution with higher amounts of fluids than the cell will cause the cell to swell and expand. The opposite happens in hypertonic when the solution has fewer fluids than the cell, causing the cell to shrink. Essentially the liquid moves from the higher concentration to the lower one.
Find the mass of liquid water required to absorb 3.12×10^4 kJ of heat energy on boiling.
Answer in units of g.
Approximately 13836 grams (or 13.8 kg) of liquid water is required to absorb 3.12×10^4 kJ of heat energy on boiling.
How to find the mass of liquid water required to absorb ?To find the mass of liquid water required to absorb 3.12×10^4 kJ of heat energy on boiling, we need to use the following formula:
q = m * ΔH
Where
q is the heat energy absorbedm is the mass of the waterΔH is the enthalpy of vaporization of waterThe enthalpy of vaporization of water is 40.7 kJ/mol.
To convert kJ to J, we multiply by 1000:
q = 3.12×10^4 kJ = 3.12×10^7 J
Substituting the values, we get:
3.12×10^7 J = m * (40.7 kJ/mol)
To solve for the mass of water, we need to first convert the enthalpy of vaporization to J/g:
40.7 kJ/mol = 40.7×10^3 J/mol
The molar mass of water is 18.015 g/mol, so we can calculate the enthalpy of vaporization per gram:
40.7×10^3 J/mol / 18.015 g/mol = 2257 J/g
Substituting this value, we get:
3.12×10^7 J = m * (2257 J/g)
Solving for m, we get:
m = 3.12×10^7 J / (2257 J/g)
m ≈ 13836 g
Therefore, approximately 13836 grams (or 13.8 kg) of liquid water is required to absorb 3.12×10^4 kJ of heat energy on boiling.
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Which of the following demonstrates how natural selection can occur within a population?
a)Competition within the population decreases because of unlimited resources
b)The number of organism in the population decreases because of a limited number of births
c)Females choose mates based in the brightness of the coloration of males within the population
d)The organism in the population experience genetic stability with regard to physical traits
Answer:
C. Females choose mates based in the brightness of the coloration of males within the population
Explanation:
Natural selection occurs when individuals with certain genotypes are more likely than individuals with other genotypes to survive and reproduce, and thus to pass on their alleles to the next generation.
The oxidation of so2 to so3 is accelerated by no2. The reaction proceeds according to:no2(g)+so2(g)⟶no(g)+so3(g)2no(g)+o2(g)⟶2no2(g)part ashow that, with appropriate coefficients, the two reactions can be summed to give the overall oxidation of so2 by o2 to give so3. Express your answer as a chemical equation. Identify all of the phases in your answer
The overall reaction for the oxidation of SO2 by O2 to give SO3 is:
SO2(g) + O2(g) ⟶ 2SO3(g)
The two given reactions are:
NO2(g) + SO2(g) ⟶ NO(g) + SO3(g)
2NO(g) + O2(g) ⟶ 2NO2(g)
Adding these reactions, we get:
NO2(g) + SO2(g) ⟶ NO(g) + SO3(g)
2NO(g) + O2(g) ⟶ 2NO2(g)
2NO2(g) + SO2(g) + O2(g) ⟶ 2NO(g) + 2SO3(g)
Therefore, the overall reaction for the oxidation of SO2 by O2 to give SO3 is:
SO2(g) + O2(g) ⟶ 2SO3(g)
where the catalyst NO2 is not explicitly shown. All the reactants and products are in the gas phase.
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How many grams are in 6.500 moles of calcium nitride, Ca3N2?
There are 960.39 grams in 6.500 moles of calcium nitride (Ca3N2).
What is meant by moles?Mole is defined as to be containing exactly 6.02214076×10²³ elementary entities and mole is the unit of amount of substance in the International System of Units.
Molar mass of calcium nitride (Ca3N2) is: 3 (atomic mass of calcium) + 2 (atomic mass of nitrogen)
= 3(40.08 g/mol) + 2(14.01 g/mol)
= 120.24 g/mol + 28.02 g/mol
= 148.26 g/mol
mass (g) = moles × molar mass
mass (g) = 6.500 mol × 148.26 g/mol
= 960.39 g
Therefore, there are 960.39 grams in 6.500 moles of calcium nitride (Ca3N2).
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please separate them so I can put it in the right box AND
PLEASE DON'T GET IT FROM WEBSITE MAKE UP YOUR OWN
if it's right Phases of Matter—Comic Strip Template
Instructions: Create a comic strip detailing the adventure of your character as the character is exposed to thermal energy, causing it to undergo phase changes from a solid, to a liquid, to a gas. Place drawings inside the boxes and written content on the lines below each box.
Your presentation must include the following:
title and introduction of your character, including what substance it is made of
source of thermal energy your character encountered (conduction, convection, and/or radiation)
detailed description and/or diagram of the particle transformation from solid to liquid phase
detailed description and/or diagram of the particle transformation from liquid to gas phase
Title of your comic strip: __________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
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will make brainiest :)
Title of your comic strip: Adventures of Ice Cube.
So, the title will be "Adventure of Ice Cube".
Define the term title.
The term title refers to the name or heading given to a book, article, movie, piece of music, or other creative work that identifies it and distinguishes it from other works. It can also refer to a position or designation given to a person, such as a job title or academic title.
Box 1:
Introduction of character: Meet Ice Cube, a small, square-shaped piece of ice made of water molecules. Ice Cube was comfortably sitting in a glass of water until he was exposed to thermal energy.
Caption: This is Ice Cube. He is made of water molecules.
Box 2:
Source of thermal energy: A warm hand holding the glass of water.
Caption: Suddenly, a warm hand holds the glass of water.
Box 3:
Solid to liquid phase: Ice Cube starts to melt and becomes a liquid as it absorbs thermal energy from the warm hand.
Caption: Ice Cube starts to melt as he absorbs thermal energy from the warm hand.
Box 4:
Liquid to gas phase: Ice Cube continues to absorb thermal energy, and as a result, it transforms into water vapor and evaporates into the air.
Caption: As Ice Cube continues to absorb thermal energy, it transforms into water vapor and evaporates into the air.
Box 5:
Conclusion: Ice Cube's adventure comes to an end, but he realizes that he is never really gone, as his water molecules will always be a part of the water cycle.
Caption: The end. Ice Cube is gone, but his water molecules will always be a part of the water cycle.
Box 6:
Additional Information: Show the water cycle and explain how Ice Cube's water molecules can be a part of it.
Caption: Ice Cube's water molecules will eventually come together with other water molecules to form clouds and rain. Then, they will flow into rivers and oceans, and the cycle starts again.
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Science (middle school work)
The answers include the following:
Population have variations which is the level of differences between two or more populations such as height and color differences etc.Some variations are favorable such that it makes an individual or organism better suited to survive and reproduce in their environment and an example is the long neck of the giraffe.Those that survive have favorable traits because it gives them some advantage and are more likely to survive and reproduce such as the speed of some preys such as deer etc.What is Variation?This is referred to as the difference in DNA among individuals or the differences between populations.
The organisms which survive have favorable traits because it gives them some advantage and are more likely to survive and reproduce such as the speed of some preys such as deer which helps it to evade predators and gives them enough time to mate and reproduce.
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HELP WOTH NUMBER 7 PLEAAASE AM A I TURNING 5 MOLES OF COPPER INTO COPPER II NITRATE? ORRRR……
The mass of copper (ii) nitrate formed is 469 g Cu(NO₃)₂
What moles of copper nitrate are formed?The balanced chemical equation for the reaction between copper and silver is as follows:
Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 AgFrom the equation, the mole ratio of Ag and Cu(NO₃)₂ is 2 : 1
5.0 moles Ag × 1 mole Cu / 2 moles Ag = 2.5 moles Cu
2.5 moles Cu × 1 mole Cu(NO3)2 / 1 mole Cu = 2.5 moles Cu(NO₃)₂
The mass of 2.5 moles Cu(NO₃)₂ = 2.5₂ × 187.56 g/mol
Mass of copper (ii) nitrate = 469 g Cu(NO₃)₂
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Please i need help urgently. Is the formation of a fluid bubble on the penny an example of cohesion or adhesion? Explain
Answer:
The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off.
Explanation:
The formation of a fluid bubble on a penny is an example of cohesion, not adhesion.
When a penny is wetted with a small amount of water, the water molecules are attracted to each other by cohesive forces, which are intermolecular forces that bind molecules of the same substance together. As a result, the water molecules tend to stick to each other rather than to the surface of the penny, forming a rounded shape or a "bubble".
The cohesive forces between water molecules are strong enough to overcome the gravitational force acting on the small volume of water on the penny, which is why the water does not run off the penny. This phenomenon is also known as surface tension, which is the cohesive force that acts between molecules at the surface of a liquid.
In contrast, adhesion refers to the intermolecular forces that bind different substances together, such as the attraction between water molecules and a surface. If the adhesive forces between water and the penny were stronger than the cohesive forces between water molecules, the water would spread out over the surface of the penny, rather than forming a bubble. However, in the case of the penny and water, the cohesive forces between water molecules are stronger than the adhesive forces between water and the penny, resulting in a fluid bubble.
What is the source of nearly all of the energy for producers and consumers? Responses A. sunlight B. oxygen C.plants D. water
Answer:
A. sunlight
Explanation:
The source of nearly all of the energy for producers and consumers is sunlight
How many moles of water will be produced from the complete combustion of 3 moles of C3H8?
If you have 3 moles of carbon dioxide and 4 moles of water that is being produced by a combustion of propane. That would make your answer be 4 moles
Hope this helps :)
The beta decay of potassium 40 produces a beta particle and an atom with an atomic number of
A:18
B:39
C:20
D:21
The beta decay of potassium 40 produces a beta particle and an atom with an atomic number of 19.
So option C is correct answer.
What is Atomic Number?
The atomic number is the number of protons found in the nucleus of an atom of a chemical element. It is a fundamental property of an element, which determines its identity and its position in the periodic table.
Each element has a unique atomic number, which is represented by the symbol Z. For example, the element hydrogen has an atomic number of 1, which means that it has one proton in its nucleus. The element carbon has an atomic number of 6, indicating that it has six protons in its nucleus.
potassium that undergoes beta decay. During beta decay, a neutron in the nucleus of the potassium 40 atom is converted into a proton, and a beta particle (which is an electron) is emitted. The resulting atom has one more proton in its nucleus than the original atom, so its atomic number increases by one to 20.
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True or False: As a ball falls toward the ground, the ball's potential energy decreases as it converts to kinetic energy.
Answer:
I think it is true
Explanation:
I just answer this question
Identify the Lewis base in this balanced equation:
A Lewis base compound has a pair of electrons that are 'donated' to an electron-acceptor forming a covalent bond. A Lewis Base will have lone-pair electrons. All anions are Lewis Bases considering they donate electrons.
Is NH3 a Lewis base?Image result for Identify the Lewis base in this balanced equation: Identify the Lewis base in this balanced equation: - 1
The lone pair on the nitrogen atom is transferred to the hydrogen ion, making the NH3 a Lewis base while the H+ is a Lewis acid.
Is BF3 a Lewis base?Image end result for Identify the Lewis base in this balanced equation: Identify the Lewis base in this balanced equation: - 1
BF3 is a Lewis acid, but be aware it has no H to donate, it represents a new type of acids.
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Answer:NH3
Just know I got it wrong so you can get it right
A contained sample of hydrogen gas is at 30°C and exerts a pressure of 0.45 atm. What will be the new pressure if the gas cools to -14°C and the volume remains constant?
Answer: .38 atm
Explanation:
p2= p1 x t2 / t1
0.45 x 259.15 / 303.15
Energy in Chemical Reactions II: Reflect
Write a reflection about your learning in this unit. Your reflection should be at least three sentences. Use the following sentence starters as a guide.
- I feel confident about modeling how the energy in a reaction will change, because…
- To try to make sure to consider all of the bonds involved in a change from reactants to products, one strategy I used was…
- If I am not sure about the bond, energies and potential energies in a reaction, one strategy, I can use is…
- If I am not sure about how the energy moves between the system and the surroundings in a reaction on strategy, I can use it…
PLEASE HELP ME I NEED THIS ASAPP!!!!
I feel confident about modeling how the energy in a reaction will change, because this unit provided me with the information necessary to determine the type. With this knowledge, I can now interrelate with other properties and believe that this new ability will assist in future units as well. This unit has encouraged a deeper understanding of the world and its guiding principles.
(HOPE THIS HELPS <3)
Which orbitals can overlap to form a pi bond?
Answer:
Explanation:
In addition, use Form 1099-MISC to report that you made direct sales of at least $5,000 of consumer products to a buyer for resale anywhere other than a permanent retail establishment.
Answer:
Pi bonds are formed from the overlap of parallel p orbitals on adjacent atoms. They are not formed from hybrid orbitals.
Which stars have the highest absolute brightness?
The HR diagram is shown with Absolute Brightness on the y axis from negative four to six and Surface Temperature on the x axis from 40,000 to 2,500 degrees Celsius. There are several dots plotted between four and six absolute brightness and 10,000 to 2,500 degrees Celsius labeled Supergiants. There are several dots plotted between 1.5 and three absolute brightness and 7,500 to 2,500 degrees Celsius labeled Giants. There are several dots plotted between negative four and negative two absolute brightness and 30,000 to 7,500 degrees Celsius labeled Dwarfs. Down the middle, there are several dots plotted diagonally from ordered pair 40,000 and five down to 2,500 and negative three labeled Main Sequence.
Supergiants
Giants
Yellow stars
Dwarfs
Answer:Super-giants
Explanation:
(WILL TRY TO GIVE BRAINLY!!!!!!!)
Courtney burns wood in an outdoor firepit. She measures the mass of the ashes that remain after the fire, and the mass is much lower than the wood that she burned. What would be the best explanation for what Courtney observes?
A. gases are released into the air
B. water inside the wood solidifies
C. heat caused the molecules to lose density
D. atoms in the wood are destroyed
Answer:
When wood is burned, it undergoes a chemical reaction called combustion, which produces heat, light, and various gases such as carbon dioxide, water vapor, and nitrogen oxides. These gases are released into the air, leaving behind a residue of ash that is much lighter than the original wood. Therefore, option A is the best explanation for what Courtney observes.
what is the iupac name of this element :NaB(OH)4
The IUPAC name of the compound NaB(OH)4 is sodium tetrahydroxyborate.
What is the iupac name of this element ?
The compound NaB(OH)4 is made up of sodium ions (Na+) and tetrahydroxyborate anions (B(OH)4-).
According to IUPAC naming conventions, the name of an ionic compound is written by listing the cation first, followed by the anion. In this case, the cation is sodium (Na+) and the anion is tetrahydroxyborate (B(OH)4-).
To name the tetrahydroxyborate anion, we start by identifying the boron atom, which has a valency of three. The hydroxide ions (OH-) are then added to balance the charge, resulting in the formula B(OH)4-.
The prefix "tetra-" indicates that there are four hydroxide groups attached to the boron atom. The suffix "-ate" is used to indicate that this is an anion.
Finally, the name of the compound is written as "sodium tetrahydroxyborate" because it contains one sodium cation and one tetrahydroxyborate anion.
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help i dont understand how to answer the question
Pressure is independent variable and volume is dependent variable. During the investigation, the temperature and quantity of gas are kept constant.
What is Boyle's law?Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law, seems to be an observational gas law that specifies the connection between confined gas pressure and volume.
If the temperature as well as quantity of gas stay constant within a closed system, the absolute pressure applied by a constant amount of an ideal gas seems to be inversely correlated with the volume it fills. Pressure is independent variable and volume is dependent variable.
Therefore, pressure is independent variable and volume is dependent variable. During the investigation, the temperature and quantity of gas are kept constant.
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Use the equation for Charles’s Law to calculate the following. (2pts)
A plastic bottle is filled with a gas to the volume of 0.50 L at a temperature of 294.15K. The bottle then placed in a freezer for 24 hours at a temperature of 273.15K.
What is the volume of gas inside the plastic bottle when it is taken out of the freezer?
Answer:
670,385k
Explanation:
Question 9 (1 point) H₂PO₂ (aq) + 3NaOH(aq) A 25 mL sample of 4 M NaOH is necessary to neutralize 50 mL of NaOH (aq). What was the concentration of the sodium hydroxide solutions?
The concentration of the H₂PO₂ solution was 0.66 M.
How to determine the concentration of the sodium hydroxide solutions ?
The balanced chemical equation for the reaction between H₂PO₂ and NaOH is:
H₂PO₂ (aq) + 3NaOH(aq) → Na₃PO₄(aq) + 2H₂O(l)
From the equation, we can see that 3 moles of NaOH are required to react with 1 mole of H₂PO₂.
Let's start by calculating the number of moles of NaOH that reacted with the H₂PO₂:
moles of NaOH = concentration x volume = 4 M x 0.025 L = 0.1 moles
Since 3 moles of NaOH are required to react with 1 mole of H₂PO₂, the number of moles of H₂PO₂ present in the reaction is:
moles of H₂PO₂ = 0.1 moles / 3 = 0.033 moles
Now, let's use the volume of the H₂PO₂ solution to calculate its concentration:
concentration of H₂PO₂ = moles / volume = 0.033 moles / 0.05 L = 0.66 M
Therefore, the concentration of the H₂PO₂ solution was 0.66 M.
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NEED HELP ASAP!! 100 POINTS!!
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.
I need the answer and all the steps.
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.
ANSWER:
[H+] = [H3O+] = 2.52 * 10^-7M
pH = -log [H+]
pH = -log [2.51*10^-7]
pH = -[-6.60]
pH = 6.60
Hope this helps :)
pt.2 of first question… please help
The amount of the propane can be obtained from the mass and the mass of the propane.
How do you calculate the amount of propane gas in mole?To calculate the amount of propane gas in moles, you need to know the mass of propane gas and its molar mass. The molar mass of propane (C3H8) is approximately 44.1 g/mol.
Once you know the mass of the propane gas, you can use the following formula:
moles = mass (in grams) / molar mass (in grams per mole)
For example, let's say you have 88.2 g of propane gas:
moles = 88.2 g / 44.1 g/mol
moles = 2.0 mol
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What is the correct answer help
The bond is a double covalent bond
What type of Bond is in N2 molecule?
The bond in the N2 molecule is a double covalent bond. In a covalent bond, atoms share electrons to fill their outermost valence shells and achieve greater stability.
In the case of the N2 molecule, each nitrogen atom has five valence electrons, and they share three electrons with each other to form a triple covalent bond. This results in a stable N2 molecule, with each nitrogen atom having a full outer shell of eight electrons.
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