The four gases below are given. 1 $\text{CH}_4$ 2 $\text{NH}_3$ 3 $\text{CO}_2$ 4 $\text{N}_2$ A $1\,\text{mol dm}^{-3}$ sample of each of gases 1-4 is allowed to diffuse. In what sequence do their diffusion rates occur at room temperature and pressure?
- Aslowest: 1, 2 → fastest: 4, 3
- Bslowest: 2, 1 → fastest: 3, 4
- Cslowest: 3, 4 → fastest: 2, 1
- Dslowest: 4, 1 → fastest: 3, 2