Question

How many electrons, protons and neutrons are there in $16$g of ${}_8{O}^{16}$?

Answer 1

$16gof{}_8{O}^{16}$

No. of moles $=\frac{givenmass}{molarmass}=\frac{16}{16}=1mole$

No. of electron = No. of proton = 8

No. of neutron = Mass no. - Mass of proton

$=16-8=8$