A walnut stuck to a pin is burned beneath a can containing 100.0 grams of water at 21°C. After the walnut has completely burned, the water's final temperature is a warmer 28°C. How much heat energy arose from the burning walnut?

Question

Quizplus · Accepted Answer

The heat energy can be calculated using the formula: q = mcΔT, where m is the mass of the water (100.0 g), c is the specific heat capacity of water (4.18 J/g°C), and ΔT is the change in temperature (28°C - 21°C = 7°C). Thus, q = 100.0 g * 4.18 J/g°C * 7°C = 2,926 J, which is approximately 3,000 joules.

A Walnut Stuck to a Pin Is Burned Beneath a Can