Some Helps with the Concepts! Thermodynamics of Material Engineering. 6. A cylin

Question

Some Helps with the Concepts!

Thermodynamics of Material Engineering.

6. A cylinder/piston contains 1 kg methane gas at 100 kPa, 20 °C. The gas is compressed reversibly to a pressure of 800 kPa. What is the work required if the process is isothermal (the molar mass of methane is 16.04 g/mol)? (a)-516 kl (b) -416 kJ (c)-316 k (d) -216 kJ (e) -116 kJ 7. what is the mass of oxygen contained in a room 6x10x4 m" if the pressure is 100 kPa and the temperature 25 °C. (a) 310 Kg (b) 300 Kg (c) 290 Kg (d) 280 Kg (e) 270 Kg 8. For an reguiar (ideal) solution between components A and B, the entropy change is (a) zero (b) positive (c) GM--RT(XalnxAtXaIn%) (d) G is zero (e) negative 9. In a regular solution, the parabolic function is used to express (a) entropy(b) volume (c)enthalpy (d) Gibbs free energy (e) density change

Explanation / Answer

Ans 6

Work require in reversible isothermal compression process

W = - nRT ln (P1/P2)

= (1000g/16.04g/mol) x 8.314 J/mol·K x (293K) x ln (100/800)

= - 315805 J = - 316 kJ

Option C is the correct answer

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