How many grams of H2O are present in 0.25 moles of it?

Understand the Problem

The question is asking for the mass of H2O (water) in grams that corresponds to a quantity of 0.25 moles. To solve this, we will need to use the molar mass of water, which is approximately 18.02 g/mol, and apply the formula: mass = moles × molar mass.

Answer

The mass of H2O is approximately 4.51 g.

Steps to Solve

Identify the molar mass of water (H2O)

The molar mass of water is approximately 18.02 g/mol. This value is essential for calculating the mass from the number of moles.

Set up the formula for mass

Using the formula ( \text{mass} = \text{moles} \times \text{molar mass} ), we can now substitute the values.

Calculate the mass

Substituting the given values into the formula:

$$ \text{mass} = 0.25 , \text{mol} \times 18.02 , \text{g/mol} $$

Perform the arithmetic

Now, calculate the mass:

$$ \text{mass} = 0.25 \times 18.02 = 4.505 , \text{g} $$

The mass of H2O present in 0.25 mol is approximately 4.51 g.

More Information

This calculation shows how to convert moles of a substance into grams using its molar mass, which is a fundamental concept in chemistry related to stoichiometry.

Tips

Not using the correct molar mass for water. Ensure to use 18.02 g/mol.
Forgetting to multiply properly. Double-check arithmetic calculations to avoid mistakes.

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