Question

Calculate the number of electrons, protons and neutrons in $1$ mole of ${}^{16}{O}^{-2}$ ions.

Answer 1

Atomic number of Oxygen is 8

Atomic mass of Oxygen is 16

we know that

Mass number=No. of proton+No. of neutron

No. of neutron in O atom is $=16-8=8$

No. of proton in O atom$=8$ (atomic number=no of proton)

No. of electron in O atom$=8$ (no. of proton=no.of electron for neutral atom)

In $O^{-2}$ ion

No. of electron$=8+2=10$

$1mole=6.022\times {10}^{23}$ ions

No. of electrons in $1mole$ of $O^{-2}=10\times 6.022\times {10}^{23}=6.022\times {10}^{24}$

No. of protons in $1mole$ of $O^{-2}=8\times 6.022\times {10}^{23}=48.176\times {10}^{23}$

No. of neutrons in $1mole$ of $O^{-2}=8\times 6.022\times {10}^{23}=48.176\times {10}^{23}$