45. A tank contains 90 ft3

of air at a pressure of 350 psig; if the air is cooled until its pressure

and temperature decreases at 200 psig and 70°F respectively, what is the decrease in internal

energy?

A. 6232.09 Btu

B. -5552 Btu

C. 5552 Btu

D. -6232.09 Btu