Question

How many molecules are in 35.2 g Nh3?

Answer 1

N=14, H=1, Molar mass = $14+1\times 3=17$

no. of moles $=35.2/17=2.07moles$

no. of $NH_3 molecules=2.07\times6.02\times 10^{23}=1.246\times 10^{24} molecules$