What volume in liters does 500g He occupy at 25C and 700mm Hg?
Answer:
Use the equation PV=nRT. R is the temperature in Kelivin, so 25 + 273=298 K. R is the gas constant .0821 L* atm/(moles * K). Use stocihiometry to convert 500 g He to moles of He, so 500 g/4.0. This is 125 moles which is n. Pressure needs to be in atm, so 700 mm Hg/760 mm Hg gives pressure in atm. You know R, n, T, and P, so you can get volume, or V.
This problem uses the ideal gas equation, PV=nRT.
500g He = 125 moles He
700 mmHg = 0.921 atm
25C = 298K
(0.921) * V = (125) * (0.0821) * (298)
V = 3,320.55 L
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