One mole of an ideal gas (C p =7R/2) in a closed piston/cylinder is expanded from T

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One mole of an ideal gas (Cp=7R/2) in a closed piston/cylinder is expanded from Ti = 700 K, Pi = 0.75 MPa to Pf = 0.1 MPa by the following pathways. For each pathway, calculate ΔU, ΔH, Q, and WEC

(a) Isothermal; 

(b) Constant volume; 

(c) Adiabatic.

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