Solve PV = nRT for pressure, volume, amount or temperature: leave the unknown blank. Pressure is in atm, volume in litres and R = 0.08206 L·atm/mol·K.
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From the article Ideal Gas Law PV = nRT — Units, R Values and Solved Problems.
2.00 mol of a gas occupies 10.0 L at 300 K. Find the pressure in atm.
Units are litres and we want atm, so R = 0.0821 L atm K⁻¹ mol⁻¹.
P = nRT / V = (2.00 × 0.0821 × 300) ÷ 10.0
0.0821 × 300 = 24.63
24.63 × 2.00 = 49.26
P = 49.26 ÷ 10.0 = 4.93 atm
Worked in full in Ideal Gas Law PV = nRT — Units, R Values and Solved Problems.
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