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Question

If mass of neutron is assumed to half of its original value, whereas that of proton is assumed to be twice of its original value, then the atomic mass of 146C will be:

A
same
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B
14.28% more
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C
14.25% less
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D
28.56% less
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Solution

The correct option is C 14.28% more
146C
number of proton= 6
number of neutron = 8
mass of proton = 6 amu
mass of neutron = 8 amu
total mass = 6 + 8 = 14
now the mass of neutron s halved so,= 8/2 = 4
the mass of proton is doubles = 6 x2
new mass = 6x2 + 4 = 16 amu
% of increase in mass= 16 -14/ 14 x 100
=14.28

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