Question

what is the molecular mass of of H2O if atomic mass of Hydrogen and oxygen respectively are 1 & 8 
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Answer 1

Explanation:

The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

Answer 2

Answer:

17u

Explanation:

1+2×16

17u is molecular mass