Chapter 15, Problem 114E

It is a hot summer day, and Chris wants a glass of lemonade. There is none in the refrigerator, so a new batch is prepared from freshly squeezed lemons. When finished, there are $\text{175}\text{g}$ of lemonade at $23\text{°C}$. That is not a very refreshing temperature, so it must be cooled with ice. But Chris doesn’t like ice in lemonade! Therefore, just enough ice is used to cool the lemonade to $5\text{°C}$. Of course, the ice will melt and reach the same temperature. If the ice starts melting at $-8\text{°C}$, and if the specific heat of lemonade is the same as that of water, how many grams of ice does Chris use? Assume there is no heat transfer to or from the surroundings. Answer in two significant figures.