## PV=nRT

GabrielaG 1J
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### PV=nRT

How do we know when to use $PV=\Delta nRT$ rather than $PV=nR\Delta T$?

Chem_Mod
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### Re: PV=nRT

There are basically three scenarios when you use the ideal gas law:

P and V change isothermally: P=nRT/V

P remains constant, n remain constant, and V and T are changing (gas being heated but no chemical reaction) : PdeltaV=nRdeltaT

And during a chemical reaction at constant P and T where the number of moles of a gas change (see prob 8.117): PdeltaV=deltanRT

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