What is the molecular mass of H2O?
A. 39 g/mol
B. 29 g/mol
C. 18 g/mol
D. 09 g/mol
Calculation of Molecular Mass of H2O
Water has (H2O) has 2 elements i.e H and O
We know that
Mass of 1 mole of Hydrogen atoms= 1 g /mol
Mass of 1mole of Oxygen atoms = 16 g/mol
As there are two Hydrogen
So, Mass of two moles of Hydrogen atoms = 2x 1 g/mol = 2 g/mol.
Mass of one mole of Oxygen atoms = 1 x 16 g /mol
By adding the molar masses of all the elements,
Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.
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