Chapter 15, Problem 47PE

(a) On a winter day, a certain house loses $5.00\times {10}^8\text{J}$ of heat to the outside (about 500,000 Btu). What is the total change in entropy due to this heat transfer alone, assuming an average indoor temperature of $\text{21}.0°\text{C}$ and an average outdoor temperature of $\text{5}.00°\text{C}$ ? (b) This large change in entropy implies a large amount of energy has become unavailable to do work. Where do we find more energy when such energy is lost to us?