Section: Thermodynamics | Marks: 2
A 5 kg metal block (cp = 0.5 kJ/kg-K) at 373 K is submerged into 10 kg of water (cp = 4.2 kJ/kg-K) at 293 K in an insulated rigid container without spilling. Assuming thermal equilibrium is reached, the approximate entropy change of the universe is
- A. −0.565 kJ/K
- B. 0.073 kJ/K
- C. 0.642 kJ/K
- D. 0.963 kJ/K
Answer: B. 0.073 kJ/K