If Avogadro number $N_A$ is changed from $6.022\times {10}^{23}mo{l}^{-1}$ to 6$.022\times {10}^{23}mo{l}^{-1}$, this would change:

If Avogadro number $N_A$ , is changed from $6.022\times {10}^{23}{\text{mol}}^{-1}\to 6.022\times {10}^{20}{\text{mol}}^{-1}$, this would change the mass of one mole of carbon.
$\because$ 1 mole of carbon has mass -12 g
or $6.022\times {10}^{23}$ atoms of carbon have mass =12 g
$\therefore 6.022\times {10}^{20}$ atmos of carbon have mass
$=\frac{12}{6.022\times {10}^{23}}\times 6.022\times {10}^{20}=0.012g$