A flask contains hydrogen and oxygen in the ratio of 2: 1 by mass at temperature 27. The ratio of average kinetic energy per molecule of hydrogen and oxygen respectively is: (a) 1: 1 (b) 4: 1 (c) 1: 4 (d) 2: 1

Answer: (a). Average translational KE per molecule = 3/2kBT, the same for every gas at the same T. The mass ratio does not matter. So the answer is (a) 1:1.

A flask contains hydrogen and oxygen in the ratio of 2: 1 by mass at… | JEE Main 2023 (30 Jan, Shift 2)

Q23JEE Main 2023 · 30 JAN · SHIFT 2Easy

Pressure & Kinetic Energy of a Gas

A flask contains hydrogen and oxygen in the ratio of $2 : 1$ by mass at temperature $27^\circ\text{C}$ . The ratio of average kinetic energy per molecule of hydrogen and oxygen respectively is:

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Answer: (a)

Average translational KE per molecule $= \frac{3}{2}k_BT$ , the same for every gas at the same $T$ .
The mass ratio does not matter.
So the answer is (a) $1:1$ .

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