1a) The internal energy of a nonflow system increases by 90 kJ while the system

Question

1a) The internal energy of a nonflow system increases by 90 kJ while the system does 120 kJ of work on its surroundings. How much heat, in kJ, has been transferred to or from the system?

1b) The internal energy of a nonflow system increases by 54 BTU when 78 BTU of work is done by the system on its surroundings. How much heat, in BTU's, has been transferred to or from the system?

1a) The internal energy of a nonflow system increases by 90 kJ while the system does 120 kJ of work on its surroundings. How much heat, in kJ, has been transferred to or from the system?

1b) The internal energy of a nonflow system increases by 54 BTU when 78 BTU of work is done by the system on its surroundings. How much heat, in BTU's, has been transferred to or from the system?

Explanation / Answer

Solution; 1a:-

Given:-

Change in Internal Energy = 90 kJ

work done = 120 kJ (Work done by the system is taken as Positive)

By First law of Thermodynamics we have

Q = (E2-E1) +W

Q = 90 + 120

Q = 210 kJ. (Heat is supplied to the system)  Ans.

1b)

By FLOT we have

Q = (E2-E1) +W

Q = 54 + 78

Q = 132 BTU (Heat is supplied to the system) Ans

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