Suppose you do 100j of work in a compressing a gas

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Description

If 80 j of heat escapes in the process, what is the change in internal energy of the gas?

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Explanation & Answer

1. First, you want to convert cal to Joules (cal --> J). 
To do this, multiply the value of cal by 4.184 (1 cal = 4.184J)
500cal x 4.184J = 2092J
------------ 1 cal

2. Calculate the change in internal energy of the gas (ΔU = heat – work).ΔU = 2092J heat - 500J work 
= 1595J change in internal energy

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