Answer and Explanation:
To determine the number of moles of water in a 234.0g sample of pure H2O, we can use the molar mass of water, which is approximately 18.015 g/mol.
Here are the steps to calculate the number of moles:
1. Convert the given mass of the water sample from grams to moles using the molar mass of water:
Number of moles = Mass (g) / Molar mass (g/mol)
In this case, the mass is 234.0g and the molar mass is 18.015 g/mol.
Number of moles = 234.0g / 18.015 g/mol
2. Perform the calculation:
Number of moles = 13.000 moles (rounded to three decimal places)
Therefore, there are approximately 13.000 moles of water in a 234.0g sample of pure H2O.