Mole ConceptHard

Question

If the mass of neutron is doubled and that of proton is halved, the molecular mass of H2O containing only H1 and O16 atoms will

Options

A.Increase by about 25%
B.decrease by about 25%
C.Increase by about 16.67%
D.decrease by about 16.67%

Solution

New molecular mass of H2O = 2 × 0.5 + 1 × 20 = 21

Percentage increase in molecular mass of H2O = $\frac{21 - 18}{18} \times 100 = 16.67\%$

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