The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? 1.00 18.0 36.0 324

Answer: 1.00

Explanation:

Given that,

Amount of moles of H2O (n) = ?

Mass of H2O in grams = 18.0g

For Molar mass of water H2O, use the molar masses:

Hydrogen, H = 1g;

Oxygen, O = 16g

H2O = (1g x 2) + 16g

= 18.0g/mol

Since, amount of moles = mass in grams / molar mass

n = 18.0g / 18.0g/mol

n = 1.00 mole

Thus, there are 1.00 mole of water are contained in this sample