Find (a) the total number and (b) the total mass of neutrons in \( 7 m g \) of \( { }^{14} C \)....

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Find (a) the total number and (b) the total mass of neutrons in \( 7 m g \) of \( { }^{14} C \). (Assume that mass of a neutron \( =1.675 \times 10^{-27} \mathrm{~kg} \) ).
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