618) Which of the following has greater number of atoms 100 gm of N2 o

1.	618) Which of the following has greater number of atoms 100 gm of N2 or 100 gm ofNH3
Answer» No. of moles of atoms = weight / atomic weight. 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.

618) Which of the following has greater number of atoms 100 gm of N2 or 100 gm ofNH3

Answer»

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

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.