The molar mass of he is 4003 gmol or 4003 10 3 kgmol

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The molar mass of He is 4.003 g/mol, or 4.003 × 10 −3 kg/mol.
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Example 5.9 From Equation (5.16), Using the conversion factor 1 J = 1 kg m 2 /s 2 we get
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Example 5.9 The procedure is the same for N 2 , the molar mass of which is 28.02 g/mol, or 2.802 × 10 −2 kg/mol so that we write Check Because He is a lighter gas, we expect it to move faster, on average, than N 2 . A quick way to check the answers is to note that the ratio of the two u rms values (1.36 × 10 3 /515 ≈ 2.6) should be equal to the square root of the ratios of the molar masses of N 2 to He, that is, .
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