Chapter 3, Problem 3.38E

Estimate the entropy change of an $\text{800-lb}$ engine $\left(\text{1}\text{lb}=\text{0}\text{.455}\text{kg}\right)$ that goes from normal environmental temperature, about $\text{20}°\text{C}$, to an average operational temperature of $\text{650}°\text{C}$. The heat capacity of iron (the major component of most engines) is $\text{0}\text{.45}\text{J}/\text{g}\cdot \text{K}$.