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solution quiz2_pdf - pnp223 Quiz 2 VANDEN BOUT(53585 This...

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pnp223 – Quiz 2 – VANDEN BOUT – (53585) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points For the decomposition of ammonia to nitro- gen and hydrogen, the equilibrium constant is 1.47 × 10 6 at 298 K. Calculate the temper- ature at which K = 0 . 01. For this reaction, Δ H = 92 . 38 kJ · mol 1 . 1. 332 K 2. 117 K 3. 241 K 4. 59 K 5. 390 K correct 6. 468 K Explanation: Use the van’t Hoff equation. 002 10.0 points What would be the expression for K c for the reaction 4 NH 3 (g) + 5 O 2 (g) 4 NO(g) + 6 H 2 O(g) at equilibrium? 1. [NO] 4 [H 2 O] [NH 3 ] 4 2. [NH 3 ] 4 [O 2 ] 5 3. [NO] 4 [H 2 O] 6 [NH 3 ] 4 [O 2 ] 5 correct 4. [NH 3 ] 4 [O 2 ] 5 [NO] 4 [H 2 O] 6 5. [NO] 4 [H 2 O] 6 Explanation: To write K c for a balanced chemical reac- tion, multiply the concentrations of the prod- ucts divided by the same (multiply the con- centrations) for the reactants, each raised to its coefficient in the reaction.
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