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mezya [45]
3 years ago
14

In a heat engine, if 500 J of heat enters the system, and the piston does 300 J of work, what is the final internal (thermal) en

ergy of the system if the initial energy is 1,500 J?
800 J

1,300 J

200 J

1,700 J
Chemistry
2 answers:
rodikova [14]3 years ago
8 0

Answer:

1700 J

Explanation:

jasenka [17]3 years ago
6 0

Answer: The final energy is 1,700 J

Explanation: According to first law of thermodynamics:

\Delta U=q+w

\Delta U=U_2-U_1=Final energy-initial energy=Change in internal energy

q = heat absorbed or released

w = work done by or on the system

w = work done by the system=-P\Delta V  {Work done by the system is negative as the final volume is greater than initial volume}

q = +500J   {Heat absorbed by the system is positive}

w = work done by the system = -300J

U_2-1500J=+500J-300J

U_2=1700J

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The chemical equation for the given reaction is:

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