Exam3_S2004 - Exam#3 CHEM112 S04 Name Social Security...

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1 Exam #3, CHEM112, S04 Name: __________________________________________ Social Security Number: ______________________________ Show all work!!! Circle the final answer in each problem!!! R = 0.0821 L•atm/mol•K = 8.314 J/mol•K 1 L• atm = 101.3 J w = -P V PV = const if T = const q surr = C T q surr = -q system E = q + w H = E + P V if P = const H = E + nRT G = H - T S G = G° + RTlnQ G° = -RTlnK eq K eq = e - G°/RT lnK eq = S ° R H ° RT aA + bB cC + dD rate = − [A] a t = − [B] b t = + [C] c t = + [D] d t rate = k[A] x [B] y ------------------------------------------------------------- rate = k[A] 0 [A] = [A] 0 -kt ------------------------------------------------------------- rate = k[A] 1 [A] = [A] 0 e -kt ln[A] = ln[A] 0 – kt t 1/2 = 0.693/k -------------------------------------------------------------- rate = k[A] 2 1 [A] = 1 [A] 0 + kt --------------------------------------------------------------- k = Aexp(-E a /RT) lnk = lnA - E a /R (1/T) ln k 1 k 2 = E a R 1 T 1 1 T 2
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2 1 (10 points). An ideal gas is compressed by an external pressure of 2 atm with its volume change from 40 to 25 L. Compute work (in J) performed on this gas.
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3 2 (10 points). Given the following thermodynamic data, calculate the normal boiling point of nitromethane CH 3 NO 2 in °C.
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