Many people believe that coffee (sp ht = 4.18 J/g °C) may be cooled by placing a silver spoon (sp ht = 0.237 J/g °C) in the coffee. If 250 ml (d = 1.00 g/mL) of coffee at 200°F had a spoon at 70°F placed in it, what would be the final Celsius temperature of the spoon and coffee, assuming that no heat is lost to the surroundings? The mass of the spoon is 35 g.

Question

Quizplus · Accepted Answer

The correct answer is A because the heat lost by the coffee is equal to the heat gained by the spoon. The specific heat of coffee is 4.18 J/g °C, the specific heat of silver is 0.237 J/g °C, the mass of the coffee is 250 g, the mass of the spoon is 35 g, the initial temperature of the coffee is 200°F, and the initial temperature of the spoon is 70°F. The final temperature of the spoon and coffee is 92.2°C.

Many People Believe That Coffee (Sp Ht = 4