How to Calculate Molecular Formulas Rijangly

1. What is the molar mass of H2O?

Choose one:
a. 18.02 g/mol
b. 20.04 g/mol
c. 22.12 g/mol

1. What is the molar mass of H2O?

The correct answer is a. 18.02 g/mol.

In order to calculate the molar mass of H2O, we need to consider the atomic mass of each element in the molecule. The atomic mass of hydrogen (H) is approximately 1.01 g/mol, and the atomic mass of oxygen (O) is approximately 16.00 g/mol. Therefore, the molar mass of H2O can be calculated as follows:

Molar mass of H2O = 2(atomic mass of H) + atomic mass of O = 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol.