Since Air Is a Mixture,it Does Not Have a "Molar

question 46

Multiple Choice

Since air is a mixture,it does not have a "molar mass." However,for calculation purposes,it is possible to speak of its "effective molar mass." (An effective molar mass is a weighted average of the molar masses of a mixture's components.) If air at STP has a density of 1.285 g/L,its effective molar mass is ________ g/mol.

• A)26.94
• B)31.49
• C)30.00
• D)34.42
• E)28.80

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