Question

At room temperature, a diatomic gas is found to have an r.m.s. speed of 1930 ms^-1. The gas is ______.

Options

• H₂

• Cl₂

• O₂

• F₂

Answer 1

At room temperature, a diatomic gas is found to have an r.m.s. speed of 1930 ms^-1. The gas is H₂.

Explanation:

∵ C = `sqrt((3RT)/M)`

⇒ `(1930)^2 = (3 xx 8.314 xx 300)/M`

M = `(3 xx 8.314 xx 300)/(1930 xx 1930) ≈ 2 xx 10^-3` kg

The gas is H₂.