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1) A cylindrical vessel with a diameter of 8 inches and 5 feet long contained acetylene at 300 psi gauge and 82°F. After some amount of acetylene was used, the pressure was reduced to
190 psi gauge and the temperature was 74°F. The gas constant of acetylene is 59.35 ft-lbf/lbm-°R. Determine the following:
a) What is the initial mass in Ibm of the acetylene inside the vessel?
b) How much volume in ft of acetylene was used?

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