If the mass of neutron is doubled and that of proton is halved, the...

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If the mass of neutron is doubled and that of proton is halved, the molecular mass of \( \mathrm{H}_{2} \mathrm{O} \)
\( \mathrm{P} \) containing only \( \mathrm{H}^{1} \) and \( \mathrm{O}^{16} \) atoms will
(a) increase by about \( 25 \% \).
(b) decrease by about \( 25 \% \).
(c) increase by about \( 16.67 \% \).
(d) decrease by about \( 16.67 \% \).
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