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

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) 34.4
B) 30.0
C) 26.9
D) 28.8
E) 31.4