Ethylene glycol, used as a coolant in automotive engines, has a specific heat capacity of 2.42 J/g°C. Calculate q when 3.65 kg of ethylene glycol is cooled from 132°C to 85°C.

Question

Quizplus · Accepted Answer

The heat (q) absorbed or released during a temperature change can be calculated using the formula q = mcΔT, where m is the mass in grams, c is the specific heat capacity, and ΔT is the change in temperature. Here, m = 3.65 kg = 3650 g (since 1 kg = 1000 g), c = 2.42 J/g°C, and ΔT = final temperature - initial temperature = 85°C - 132°C = -47°C. Thus, q = 3650 g * 2.42 J/g°C * (-47°C) = -414,579 J or -414.579 kJ, which rounds to approximately -420 kJ.

Ethylene Glycol, Used as a Coolant in Automotive Engines, Has