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At STP, 0.50 mol H2 gas and 1.0 mol He gas

1. have equal average kinetic energies
2. have equal molecular speeds
3. occupy equal volumes
4. have equal effusion rates

Correct answer: have equal average kinetic energies

Solution

At the same temperature (STP), all gases have the same average kinetic energy regardless of their molecular mass, as it depends only on temperature.

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