Question

0.5 moles of H2 molecule?​

Answer 1

Each hydrogen molecule has two hydrogen atoms, therefore n(H)=2⋅n(H2),N(H)=n(H)⋅NA,N(H)=2⋅n(H2)⋅NA,N(H)=2×0.5 mol×6.022×1023 mol−1,N(H)=6.022×1023.