Question

The molar mass of water is equaled to:

a) 1 g of O plus 2 g of H
b) 1 g of O plus 1 g of H
c) The mass of 1 mol of O plus the mass of 1 mol of H
d) The mass of 1 mol of O plus the mass of 2 mol of H

Answer 1

The molar mass of water is the sum of the mass of 2 mols of hydrogen and 1 mol of oxygen, which equals 18.015 g/mol.

Step-by-step explanation:

The molar mass of water is equal to the mass of 1 mol of O plus the mass of 2 mol of H. To calculate the molar mass of water (H₂O), you take the atomic masses of hydrogen and oxygen from the periodic table, multiply them by the number of atoms of each element in the formula, and add them together. The atomic mass of hydrogen is approximately 1.008 g/mol, and we have two hydrogen atoms in water, so we multiply 1.008 g/mol by 2. The atomic mass of oxygen is approximately 15.999 g/mol, and there is one oxygen atom in water. Therefore, the molar mass of water (H₂O) is 2x1.008 g/mol H + 15.999 g/mol O = 18.015 g/mol H₂O.