A container contains helium gas at 0 °C. What is the average linear momentum of a helium molecule of mass 6.64×10–27 kg in the container?

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8×10–24kg m s–1

8×10–23kg m s–1

18×10–23kg m s–1

18×10–24kg m s–1

answer is A.

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Detailed Solution

Average linear momentum is given by pavg=mvavgBut vavg=8πRTMpavg=6.64×10–278π×8.314×2734×10−3=8×10–24kg m s–1.

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