A gasoline engine absorbs 2 500 J of heat at 250°C and expels 2 000 J at a temperature of 50°C. The magnitude of the change in entropy (in J/K) for the system is

Question

Quizplus · Accepted Answer

The change in entropy (ΔS) can be calculated using:
ΔS = Q/T, where Q is the heat absorbed or released and T is the temperature in Kelvin.

In this case, ΔS = (2500 J - 2000 J) / 298 K = 1.34 J/K.

Rounding this to one decimal place gives an answer of 1.4 J/K, which corresponds to Choice C.

A Gasoline Engine Absorbs 2 500 J of Heat at 250°C