Answer to Question #25547 in Physical Chemistry for David
If one of these values is not given then it is considered a constant and 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
P2 =P1V1/V2 =1 *0.4 / 2 = 0.2 atm
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