# Answer to Question #25546 in Physical Chemistry for David

Question #25546

The volume of a sample of hydrogen is 798 mL and it exerts 621 mm Hg pressure at 5.00℃. What volume does it occupy at standard temperature and pressure?

Expert's answer

P1V1/T1 = P2V2/T2

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

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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