12. A sample of ethylene glycol, used in car radiators, has a mass of 34.8 g. The car releases, 783 J of heat. The initial temperature of the sample is 22.1 0C. What is the final temperature? The specific heat capacity of ethylene glycol is 2.42 (J/g 0C)

Question

12.	A sample of ethylene glycol, used in car radiators, has a mass of 34.8 g.  The car releases, 783 J of heat.  The initial temperature of the sample is 22.1 0C.  What is the final temperature? The specific heat capacity of ethylene glycol is 2.42 (J/g 0C)

anonymous · Answer

Would the energy released by negative?

rogue · Answer

$$Q = mc \Delta T$$
Well, the car released heat, meaning that its temperature will go down. If that happens, Tfinal - Tinitial would be negative, making Q negative.

anonymous · Answer

so what would be the answer? 31.4?

rogue · Answer

Well, the temperature has to drop since energy was released, so does your answer make sense? You probably just made a computational error somewhere.$$-783 J = 34.8 g * 2.42 J/(g*C) * (T _{f}^{} - 22.1 C)$$$$T _{f}^{} = 12.802 C$$