CHM2046Quiz3 - Quiz 3 version A Answers underlined 1a Write the equilibrium constant expression for the reaction CaSO4(s CaO(s SO3(g(omit the

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Quiz 3 version A Answers underlined 1a) Write the equilibrium constant expression for the reaction: CaSO 4 (s) CaO (s) + SO 3 (g) (omit the solids and liquids always) a) K = 1/[CaO][SO 3 ] b) K = [SO 3 ] c) K = 1/[CaSO 4 ] d) K = [CaO][SO 3 ] e) K = [CaO][SO 3 ]/[CaSO 4 ] 2a) The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10 -4 s -1 . If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s? Use ln[A]/[A] 0 = -kt ln[A]/(1.33 M) = -(6.7 × 10 -4 s -1 )(644 s) [A] = 1.33 × e -(0.431) [A] = 1.33 × 0.650 A) 0.43 M B) 0.15 M C) 0.94 M D) 0.86 M E) 0.67 M 3a) Determine the rate law and the value of k for the following reaction using the data provided. 22 28 4 3 S O (aq) 3 I (aq) 2 SO (g) I (aq) −− +→ + [S 2 O 8 2 ] (M) [I ] (M) Initial Rate (Ms -1) 0.30 0.42 4.54 0.44 0.42 6.65 0.44 0.21 3.33 [I ]: concn (0.42/0.21 = 2); rate (6.65/3.33 2) 1st order [S 2 O 8 2 ] : concn (0.44/0.30 = 1.5); rate(6.65/3.33 = 1.5) 1st order
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This note was uploaded on 09/21/2009 for the course CHM 2046 taught by Professor Dixon during the Spring '08 term at University of Central Florida.

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CHM2046Quiz3 - Quiz 3 version A Answers underlined 1a Write the equilibrium constant expression for the reaction CaSO4(s CaO(s SO3(g(omit the

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