Solve question number 4. Thanks!

4. A drum 6 inches in diameter and 40 inches long contained acetylene at 250 psia and 80 degrees Fahrenheit. After some of the acetylene was used the pressure at the drum was 100 psia and the temperature was 70 degrees Fahrenheit. The used acetylene was at 14.7 psia and 60 degrees Fahrenheit . The gas constant R for acetylene is 59.35 ft-Ib/lb-R. Determine: a) the final mass of acetylene in the drum in pounds 0.734 O 0.434 0.299 b) the mass of used acetylene in pounds 0.734 0.434 O 0.299 c) the volume of the used acetylene in cubic feet O 5.336 O 6.336 O 7.336