Homework #13-solutions

Homework #13-solutions - clow(twc432 Homework#13...

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clow (twc432) – Homework #13 – holcombe – (51160) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Consider the reaction 1 2 S 8 (s) + 3 O 2 (g) -→ 2 SO 3 (g) Which of the following is a correct expres- sion of the rate? 1. Δ[O 2 ] 3 · Δ t 2. - Δ[SO 3 ] 2 · Δ t 3. - Δ[O 2 ] 3 · Δ t correct 4. - 4 · Δ[S 8 ] Δ t 5. 2 · Δ[SO 3 ] Δ t Explanation: rate = - Δ[O 2 ] 3 · Δ t = Δ[SO 3 ] 2 · Δ t 002 10.0points One of the reactions used commercially to produce hydrogen gas is H 2 O(g) + CO(g) H 2 (g) + CO 2 (g) . A proper expression for the rate of this reaction could be 1. - Δ[H 2 ] Δt . 2. - Δ[CO 2 ] Δt . 3. + Δ[CO] Δt . 4. - Δ[H 2 O] Δt . correct Explanation: The rate of a chemical reaction can either be expressed as the rate of disappearance of the reactant (as in this case) or as the rate of the appearance of the product; however, this rate is multiplied by the inverse of the coefficient of the species in question. The negative sign here reminds us that as the reaction progresses, this species is consumed and goes down in concentration.
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  • Fall '07
  • Holcombe
  • Chemistry, Reaction, Chemical reaction, 1 m, 0.21 m, 0.314 min, 2 0.00290795 M

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