Mole ConceptHard
Question
If the atomic mass were given by as 1/6th part and molecular mass as 1/12th part by mass of one atom of C12 isotope, then what would be the molecular mass of water? Suppose atomic masses of hydrogen and oxygen on new scale are 1 and 16, respectively,
Options
A.18
B.9
C.36
D.Unpredictable
Solution
Molecular mass of H2O = $\frac{2 \times M_{H - atom}}{\frac{1}{12} \times M_{C^{12} - atom}} + 1 \times \frac{M_{O - atom}}{\frac{1}{12} \times M_{C^{12} - atom}} = 2 \times \left( \frac{2 \times M_{H - atom}}{\frac{1}{6} \times M_{C^{12} - atom}} + \frac{1 \times M_{O - atom}}{\frac{1}{6} \times M_{C^{12} - atom}} \right)$
= 2 × (2 × 1 + 1 × 16) = 36
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