Answer
2600 J/K.
Work Step by Step
The person spends 7.0 hours sleeping, 1.0 hour running, 11.0 hours sitting at work and in front of the TV/computer, and 5.0 hours in light activity. Use Table 15-2 for metabolic rates.
$$Q=((70W)(7.0h)+ (1150W)(1.0h)+ (115W)(11.0h)+ (230W)(5.0h)+)\frac{3600s}{h}=1.46\times10^7 J$$
The entropy change is due to:
a. the energy leaving the body, divided by the body temperature of 310 K.
b. the energy entering the environment, divided by the environmental temperature of, say, 294 K.
$$\Delta S=(\frac{-Q}{310K}+\frac{Q}{294K})=1.46\times10^7 J (-\frac{1}{310K}+\frac{1}{294K})$$
$$\approx 2600 J/K$$
