How many moles are in 1kg ice/water?

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  • Thread starter Bill Foster
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In summary, to find the number of moles in 1kg of ice/water, first convert the mass to grams. Then, multiply the number of grams by the mol/molar mass ratio using the molar mass of H2O. This will cancel out the grams and leave the number of moles. Alternatively, 1kg of ice/water contains 55.55 moles of H2O by converting the mass to grams and using the molar mass of 18g/mol.
  • #1
Bill Foster
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How many moles are in 1kg ice/water?
 
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  • #2
This is a very simple molar mass problem.

First, convert kg to g.
Then, multiply the number of grams by the mol/molar mass ratio. Use the molar mass of H2O.

Since grams will be being multiplied by #mols/grams, the grams cancel, leaving the number of mols in 1 kg of water/ice.
 
  • #3
Here is another simple explanation:

First convert the mass in kg to g ( 1kg=1000g). Now 18g of H20 is equivalent to 1 mole. Hence, 1000g of it would be equal to 1000/18 moles. This comes out be 55.55 moles. Thus 1 kg of water or ice has 55.55 moles of H20.
 

1. How do you calculate the number of moles in 1kg of ice/water?

To calculate the number of moles in 1kg of ice/water, you will need to know the molecular weight of water. This is approximately 18g/mol. Then, you can use the formula: number of moles = mass (in grams) / molecular weight. For 1kg of ice/water, this would be 1000g / 18g/mol = 55.56 moles.

2. Is the number of moles in 1kg of ice/water different for ice and water?

Yes, the number of moles in 1kg of ice and water will be different. This is because the molecular weight of ice and water is different. Ice has a molecular weight of approximately 18g/mol, while liquid water has a molecular weight of 18.02g/mol. Therefore, the number of moles in 1kg of ice will be slightly higher than the number of moles in 1kg of water.

3. Why is it important to know the number of moles in 1kg of ice/water?

Knowing the number of moles in 1kg of ice/water is important for various scientific calculations and experiments. It can be used to determine the concentration of a solution, the amount of reactants needed for a chemical reaction, and the amount of products produced. It is also an important factor in understanding the properties and behavior of water at different temperatures and pressures.

4. Does the temperature of the ice/water affect the number of moles in 1kg?

No, the temperature of the ice/water does not affect the number of moles in 1kg. The number of moles is solely determined by the mass and molecular weight of the substance, which remains constant regardless of temperature. However, the physical state of the water (solid ice or liquid water) will affect the number of moles, as discussed in the first question.

5. Can the number of moles in 1kg of ice/water change?

Yes, the number of moles in 1kg of ice/water can change. This can happen through physical or chemical processes. For example, when ice melts into liquid water, the number of moles remains the same but the physical state changes. Additionally, during a chemical reaction, the number of moles of reactants and products may differ, leading to a change in the number of moles in 1kg of the resulting mixture.

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