Answer on Physical Chemistry Question for David
If one of these values is not given then it is considered a constant you just leave that variable out of the equation.
PV=nRT is used when you are working the # of moles or grams. n is the # of moles so if given grams you must convert to moles before you begin.
STP (standard temperature and pressure) P= 1atm ,T= 273K, R= 0.08206 L-atm / mol-K
P1V1/T1 = P2V2/T2
760*V1/273 = 621*798/278
V1*760*278 = 273*621*798
V1 = 640mL
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