Calculate the number of molecules

Calculate the number of molecules of $S{{O}_{2}}$ present in 44 g of it.

Gram molecular mass of $S{{O}_{2}}$= 32 + 2xl6 = 64g
Number of molecules in 64 g of S02 = NA =6.022 x ${10}^{23}$
Number of molecules in 44 g of S02 = 6.022 x ${10}^{23}$ / 64 g x 44 g
= 4.14 x ${10}^{23}$