A Sample of He Gas (2

question 47

Multiple Choice

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s.The same amount of an unknown gas,under the same conditions,effused through the pinhole in 248 s.The molecular mass of the unknown gas is ________ g/mol.

• A)0.19
• B)5.5
• C)88
• D)19
• E)350

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