Question

9 Which one of the following statements is
true?
(a) Mass of 0.5 mole of N, gas > mass of 0.5
mole of N atoms
(b) Mass of 0.5 mole of N, gas = mass of 0.5
mole of O2 gas
(c) Mass of 0.5 mole of N, gas < mass of 0.5
mole of N atoms
(d) Mass of 0.5 mole of N2 gas = mass of 0.5
mole of N atoms
​

Answer 1

Answer:

A

Explanation:

Since N₂ gas exists as a diatomic molecule it has a molecular mass of 14×2=28.

Therefore its mass in 0.5 mole of it is 28×0.5=14g.

The mass of N atoms is 14×0.5 which is 7.0g.

Looking carefully at the answers, option A fits best which is the answer.