Unformatted text preview: b) What is the relative change in volume of the system (in other words, what is V 2 /V 1 )? Ideal gas law: P 1 V 1 = nRT = P 2 V 2 since n and T are constant Therefore P 1 V 1 = P 2 V 2 and V 2 /V 1 = P 1 /P 2 = 1 atm / 0.5 atm = 2 c) What is ΔE in Joules? ΔE = C v ΔT = 0 because ΔT = 0 d) What is ΔH in Joules? ΔH = C p ΔT = 0 because ΔT = 0 e) What is Δ(PV) in Joules? Δ(PV) = Δ(nRT) = nR Δ(T) = 0 because ΔT = 0 f) What is w in Joules? w =  ∫ p dV =  ∫ nRT dV = nRT ∫ dV = nRT ln (V 2 /V 1 ) V V w =  (1 mol) (8.314 J mol1 K1 ) (25+273.15) K (ln 2) = 1718 J g) What is q in Joules? Which way is heat transferred (to the system or out of the system)? q = ΔE – w = 0 – (1718 J) = +1718 J. Positive value means heat into the system. You have to show your work. No partial credit for unsubstantiated answers!...
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 Spring '11
 Berthuiame
 Thermodynamics

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