Question

find the number of atoms in 0.5 mole of C atom

Answer 1

the number of atoms in 0.5 mole of C atom is
$0.5 \times 6.023 \times {10}^{23}$

Answer 2

1 mole = 6.022 * 10^-23 atoms
0.5 moles = 3.011 * 10^-23 atoms