In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?

1,100 J

900 J

1,500 J

300 J

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

1,700 J800 J1,300 J200 J

Question

Glenn Key

Chemistry

13 October, 05:01

In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?

1,100 J

900 J

1,500 J

300 J

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

1,700 J800 J1,300 J200 J

+3

Answers (1)

Know the Answer?

Mccullough · Answer 1

We are given with:

Q = 700 J

W = 400

U1 = 1200 J

From the first law of thermodynamics

Q = ΔU + W

Q = U2 - U1 + W

U2 = Q - W + U1

U2 = 700 - 400 + 1200

U2 = 1500 J

We are given with

Q = 500 J

W = 300 J

U1 = 1500 J

U2 = 500 - 300 + 1500

U2 = 1700 J