Question

The number of mole of atoms in 8 mol of Ca3 (PO4)2

Answer 1

Number of mole of atoms in $1$ mole of $Ca_3 (PO_4)_2=3+2\times (1+4)=13$

Number of moles of atoms in $8$ moles of $Ca_3(PO_4)_2=13\times 8=104$