Which is the molar mass of H20?
O 10.02 g/mol
O 16.00 g/mol
O 17.01 g/mol
O 18.02 g/mol

D, 18.02 g/mol

D. 18.02 g/mol

Explanation:

Molar mass of any element is equal to the atomic mass of that element in the unit of grams. Molar mass is also equal to the mass of 6.02*10^23   atoms of that element.  

The water or H2O is formed from 2 mole of hydrogen and one one of oxygen

The molar mass of H = 1.008 g/ mole

The molar mass of O= 16.00g/ mole

Therefore the molar mass of water = 2* 1.008 g/ mole+16.00g/ mole

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.