anonymous
  • anonymous
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)
Chemistry
katieb
  • katieb
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anonymous
  • anonymous
Would the energy released by negative?
Rogue
  • Rogue
\[Q = mc \Delta T\] Well, the car released heat, meaning that its temperature will go down. If that happens, Tfinal - Tinitial would be negative, making Q negative.
anonymous
  • anonymous
so what would be the answer? 31.4?

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

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