What is the weight (in lbf) of one gallon of air at 1 atm and 25˚C? The molecular mass of air is 28.97 g/mole = 0.02897 kg/mole
A. 90 lbf
B. 65.78 lbf
C. 0.00989 lbf
D. 3.00989 lbf