The Mole Fraction of Nitrogen in Dry Air near Sea

Multiple Choice

The mole fraction of nitrogen in dry air near sea level is 0.78084,where the molar mass of nitrogen is 28.013.The partial pressure of nitrogen when the total atmospheric pressure (dry air) is 97.5 kPa is

A) 126
B) 4.51
C) 77.0
D) 2.16 × 10³
E) 2.75