EasyChemistryHigh School (11–12)Chemical Thermodynamics › Systems, Work, Heat and the First LawNumericalBoard Exam
A gas in a cylinder absorbs 520 J of heat from a flame…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A gas in a cylinder absorbs J of heat from a flame. At the same time it pushes out a piston, doing J of work on the surroundings. Write down and with their signs, and find .
Need a reminder? The key ideaShow
First law: . Energy into the system is positive: for heat absorbed, for work done on the system. Adiabatic change: , so . For a whole cycle, .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Signs. Heat in: J. Work done by the gas: J.
Step 2. First law. J.
Answer: J, J, J.
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