A combustion reaction releases 345 KJ of heat and produces gas that does 29 Kcal of...
A combustion reaction releases 345 KJ of heat and produces gas that does 29 Kcal of work on the lid of the container. What is the change of energy?
29kcal = 121.336 KJ
Since the reaction releases 345 KJ and then does 121.336 KJ of work on the lid of a container, I thought both would be negative, but the correct answer in our practice quiz says they should both be positive. I got -466 KJ and it says it should be +466KJ.
Homework Answers
It is asking about change of energy , it should be positive but if it asks about the final internal energy of the system then you have to subtract it from the internal energy.
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