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A car has four tyres, each filled to the same pressure separately with N2, O2, H2, and He respectively. Which tyre will be filled first (i.e., requires the least time to fill to the required pressure)?

1. N2
2. O2
3. H2
4. He

Correct answer: H2

Solution

By Graham's law of effusion, the rate of gas flow is inversely proportional to sqrt(M). H2 has the smallest molar mass (M=2), so it effuses/flows fastest and will fill the tyre in the shortest time.

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