A gas initially at 20 psia and 1.5 cu ft undergoes a process to 100 psia and .50 cu ft

A gas initially at 20 psia and 1.5 cu ft undergoes a process to 100 psia and .50 cu ft during which the enthalpy
increases by 15.5 Btu; Cv = 2.44 Btu/lb*R. Determine (a) dU, (b) Cp, and (c) R.