Homework #115 Ch.8 Ed.6

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Homework #115 Ch.8 Ed.6

Postby 805132275 » Wed Mar 13, 2019 7:22 pm

Textbook Question:"An experimental automobile burns hydrogen for fuel.
At the beginning of a test drive, the rigid 30.0-L tank was filled with hydrogen at 16.0 atm and 298 K. At the end of the drive, the temperature of the tank was still 298 K, but its pressure was 4.0 atm. (a) How many moles of H2 were burned during the drive? (b) How much heat, in kilojoules, was given off by the combustion of that amount of hydrogen?"

In the answer key, the initial number of moles was subtracted from the final. Why isn't it the opposite?

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Re: Homework #115 Ch.8 Ed.6

Postby Chem_Mod » Fri Mar 15, 2019 4:36 pm

dN = N final - N initial. This is a state function.

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