A Sample of N₂ Gas Is Contaminated with a Gas

question 38

Multiple Choice

A sample of N₂ gas is contaminated with a gas (A) of unknown molar mass.The partial pressure of each gas is known to be 200.torr at 25°C.The gases are allowed to effuse through a pinhole,and it is found that gas A escapes at 4 times the rate of N₂.The molar mass of gas A is:

• A)1.75 g/mol
• B)112 g/mol
• C)7.01 g/mol
• D)448 g/mol
• E)none of these

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