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An unknown gas diffuses 0.25 times as fast as He (M = 4 g/mol). What is its molar mass?
A64 g/mol
B32 g/mol
C128 g/mol
D16 g/mol
Answer & Solution
Correct answer: A. 64 g/mol
Rate ratio 0.25 gives sqrt(4/M) = 1/4, so M = 4 x 16 = 64 g/mol.
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