10. KEY Consider the first order reaction AB, where A rearranges to give B, time

Question

10. KEY Consider the first order reaction AB, where A rearranges to give B, time 1 minute time 0 minutes How many particles of A exist at r2 min? (A) (B) 2 (C) 4 (D) 8 11. If a reaction is exothermic and is accompanied by a step t step step w step t step decrease in entropy of the system, then the reaction is (A) spontaneous at low temperatures only. (B) spontaneous at high temperatures only (C) spontaneous at all temperatures. (D) nonspontaneous at all temperatures What is the Gibbs Free Energy change for the reaction: 12. AH J-mol104 394 -286 SJKmol 270205 214 70 (A) -2111k (C) -108,932 k aw (B) +2111 (D) +108,932 kJ (fast) (slow) (fast) (slow) (slow) (fast) escribed by 13. For which should AH and AG be about equal? What is the entropy change for this reaction? 14. So.J-K- mol CHg)270 205 0 hours for M to 70 (A) -191 J K- (C) +373 J-K (B) (D) -373 J.K- -191k/K" o 0.100 M?

Explanation / Answer

Ans 10

First order reaction

A - - - > B

As shown in the figure

Initial moles of A = 8

After 1 min

Moles of A unreacted = 4

Moles of B produced = Moles of A reacted = 4

After another 1 min or after 2 min

moles of A reacted = 4

Moles of A unreacted

= moles of A remained after 1min - moles of A reacted after 2 min

= 4 - 4 = 0

Option A is the correct answer

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