Determine the amount of air added to the tank in lbm

Reference no: EM13320634

A rigid tank contains 40 lbm of air in 20 psia and 70 degrees F. More air is added to the tank untill the pressure and temperature rise to 35 psia and 90 degrees F, respectively. Determine the amount of air added to the tank in lbm. (Book says answer is 27.4 lbm but I am not getting that.)

Reference no: EM13320634

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