Which has more number of atoms? 100g of N2 or 100 g of NH3

1. Soln:

No. of moles of atoms = weight / atomic weight. For N₂

100 gms of N₂ = 100/2 x 14 moles = 100/28 moles Number of molecules = 100 / 28 x 6.022 x 10²³

Molar mass of N₂ = 2 x molar mass of monoatomic N Molar mass of N₂ = 2 x 14.0067 = 28 moles.

Number of molecules = 100/28 x 6.022 x 10²³

No. of atoms = 2 x 100/28 x 6.022 x 10²³ = 43.01 x 10²³ For NH₃

100 gm of NH₃ = 100/17 moles

Number of molecules = 100/17 x

6.022 x 10²³ molecules

No. of atoms in NH₃ = (1 + 3) = 4 x 100/17 x 6.022 x 10²³ =

141.69 x 10²³ atoms.

Therefore, NH₃ has more atoms than N₂.