Which of the following statements is / are correct ?
I) 5 moles of CO₂ and 5 moles of H₂ O have the same mass.
II) 100 g of NH₃ has more atoms than that present in 100 g of N₂
III) 16 g of solid sulphur contains 3.76x10²² molecules

5 moles of CO₂ - 220g
5 moles of H₂O -90g
So they have different mass
17g of NH₃ - 4N_A atoms
100g of NH₃ - 4 x 5.88N_A atoms
 28g of N₂ - 2N_A atoms
100g of N₂ - 2x7.1N_A atoms
So 100 g of NH₃ has more atoms
In solid form sulphur exist as S₈
6.023 x 10²³ molecules – 1 mole of solid sulphur
8x32g of sulphur - 6.023 x 10²³
16 g of sulphur – x
$\mathrm{x}=\frac{6.023\times {10}^{23}\times 16}{8\times 32}=3.76\times {10}^{22}$