Find the number of moles of oxygen atoms present in $1.2\times {10}^{26}$ atoms of oxygen.
(Given: $N_A=6\times {10}^{23}{\text{moL}}^{-1}$)

Q. Find the number of electrons present in a pure sample of $MgS{O}_4.7H_{2}O$ containing 5.5 moles of oxygen atoms?
(Take Avogadro's number $\left(N_A\right)=6\times {10}^{23}$)

Q. Calculate number of neutrons present in $12\times {10}^{25}$ atoms of oxygen ${(}_8{O}^{17})$:
(Given : N${}_A=6\times {10}^{23}$)

Q.

If the total number of electrons present in a pure sample of $FeS{O}_4.7H_{2}O$ is $4.336\times {10}^{26}$
then the total number of moles of oxygen atoms present in $FeS{O}_4.7H_{2}O$:

Q. Find the number of electrons present in a pure sample of $MgS{O}_4.7H_{2}O$ containing 5.5 moles of oxygen atoms?
(Take Avogadro's number $\left(N_A\right)=6\times {10}^{23}$)

Q. One mole of oxygen corresponds to $6.023\times {10}^{23}$ oxygen atoms.