The average molecular speed is greatest in which of the following gas samples?

1.0 m o l N_{2}

at 560 K

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0.50 mol of Ne at 500 K

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0.20 m o l o f C O_{2}

at 440 K

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2.0 mol of He at 140 K

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Solution

The correct option is C 2.0 mol of He at 140 K
The average molecular speed is inversely proportional to the square root of molar mass.
$v = \sqrt{\frac{8 R T}{π M}}$
Hence, He (having lowest molar mass, 2 g/mol) has maximum average velocity.

Suggest Corrections

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^{'} N_{2}^{'}

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240 K

{Molecular mass of O_{2} = 32 g/mol & He = 4 g/mol}

240 K

{Molecular mass of O_{2} = 32 g/mol & He = 4 g/mol}

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