Three different processes act on a system. (a) In process A, 43 J of work are do

Question

Three different processes act on a system.

(a) In process A, 43 J of work are done on the system and 66 J of heat are added to the system. Find the change in the system's internal energy.
J

(b) In process B, the system does 43 J of work and 66 J of heat are added to the system. What is the change in the system's internal energy?
J

(c) In process C, the system's internal energy decreases by 107 J while the system performs  107 J of work on its surroundings. How much heat was added to the system?
J

Explanation / Answer

a.note that work done on the system is negative and that done by the gas is positive.

in a , we know dQ = dU + dW where dQ is the heat and dU is the change in internal energy

. dU = dQ - dW = 66 - ( - 43) = 109 J

b. here dU = 66 - 43 = 23J

c. here dQ = dU + dW = 107 +107 = 214J

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