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Explain what internal energy for a system is
QUESTION 1. (20 MARKS).
1.Two moles of an ideal monoatomic gas (CV=20.9JK-1mol-1)are heated from 300K to 350K.The volume of the gas changes from 0.02m3 to 0.2m3.Assuming that the heat capacity remains constant in this temperature change for the system, calculate;
i. Entropy change for the system.
ii. Entropy change for the surroundings.
iii. Entropy change for the universe. (20 marks)
QUESTION FOUR 2.
i. State the first law of thermodynamics.(2 marks)
ii. Explain what heat is and work in thermodynamics.(2marks)
iii. Explain what internal energy for a system is.(2 marks)
iv. Explain the meaning of a thermodynamic system(2marks)
v. What is a state function ?Give an example(2 marks)
B) Calculate the work done when 2 moles of H2 expands.
i. Isothermally against a constant pressure of atm at 250C from 15 liters to 50 liters.(5 marks)
ii. The gas expands isothermally and reversibly.(5 marks)
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