A gas undergoes a process by which the internal energy of the gas decreases by 5

Question

A gas undergoes a process by which the internal energy of the gas decreases by 5000 J while the gas does +4000 J of work. How much energy does the gas exchange with its environment during the process? Does the gas absorb or emit this energy? Does the volume of the gas increase, decrease, or remain the same during the process? Explain your reasoning. Does the temperature of the gas increase, decrease, or remain the same during the process? Explain your reasoning. What, if anything, can be concluded about the pressure of the gas during the process? Explain your reasoning.

Explanation / Answer

We know,

U = Q- W

-5000 = Q - 4000

Q = -1000 J

a) So, the gas absorbs 1000 J of energy

b)Since the +ve work has been done the volume of the gas increases, if it remains same work done has to be 0 and if it decrease work done will be -ve so, volume increase

c)Since, energy is absorbed the temperature increases

d)Nothing can be concluded about pressure as it may increase or decrease or reamain the same

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