QUESTION 7 Consider 0.5 mole sample of Ar at 85.0 ° C where the initial pressure

Question

QUESTION 7 Consider 0.5 mole sample of Ar at 85.0 ° C where the initial pressure is 7.00 bar. The gas undergoes a change of state to a final pressure of 3.70 bar but does so freely (against zero external pressure). Assume the gas behaves ideally the work for this process is Zero B.-500J C.948 J D 500 J QUESTION 8 If an electric motor produced 10 kJ of energy each second as mechanical work and lost 5 kJ as heat to the surroundings, then the change in the internal energy of the motor each second is A-15 kJ, and it is an endothermic process B.5 kJ, and it is an endothermic process OC.5 kJ, and it is an exothermic process D 15 kJ, and it is an exothermic process

Explanation / Answer

7)

Here external pressure is 0

Word done is defined as:

W = -Pext*(Vf-Vi)

since Pext is 0, work done will be 0

Answer: A

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