Question

A system does 1.80×10^{8}J of work while 7.50×10⁸J of heat transfer occurs to the environment. What is the change in internal energy of the system assuming no other changes (such as in temperature or by the addition of fuel)?

Answer 1

Answer:

The internal energy is decreased by 9.3 *10⁸ J.

Explanation:

Law of thermodynamics:

The change in internal energy (ΔU) is equal to the difference of net heat transfer (Q) occurring in the system and the net work (W) done by the system or on the system.

       ΔU = Q - W

Q = -7.50 * 10⁸ J and W = 1.8 *10⁸ J

ΔU = -7.50 *10⁸ - 1.8 * 10⁸

     = (-7.50 - 1.8) * 10⁸

     = - 9.3 *10⁸ J