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$Ar$ and He are both gases at room temperature. How do the average molecular velocities (V) of their atoms compare at this temperature?

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$V_{He} = 10 V_{Ar}$

$V_{Ar} = 10 V_{He}$

$V_{He} = 3 V_{Ar}$

$V_{Ar} = 3 V_{He}$

answer is C.

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Detailed Solution

The average molecular speed in a sample of Ar gas at a certain temperature is 389 m/s.

The average speed of a helium atom at 25 degree Celsius is $1. 23 \times 10^{3} ms - 1 .$

The average speed of a helium atom is three times of argon.

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