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A cylinder-piston arrangement contains m = 1 kg of water, initially in the satur liquid state at P₁ = 0.8 MPa. It absorbs heat from a reservoir at Tᵣ=250°C. During process the piston moves in such a way that the pressure remains constant. At the of the process, water has completely evaporated into steam. Determine: (a) Heat transferred Q₁₂ (b) Change in entropy of the system ∆S₁₂ (c) Change in entropy of the reservoir ∆Sᵣ (d) Change in entropy of the universe ∆Sᵤ
Sagot :
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