A flask contains hydrogen and argon in the mass ratio 2:1 at 30°C. The ratio of average kinetic energy per molecule Kₐᵣ/Kₕ₂ is:
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Question

A flask contains hydrogen and argon in the mass ratio 2:1 at 30°C. The ratio of average kinetic energy per molecule Kₐᵣ/Kₕ₂ is:

G1 Physics · Accepted Answer

Average translational kinetic energy per molecule of an ideal gas is: K̄ = 3kʙT/2 It depends only on temperature, not on molecular mass. Both gases are at the same temperature. Therefore: Kₐᵣ/Kₕ₂ = 1 Hence option C.