## Answers

H2CO3(9) -> H26 (as) +2 (aa) initally after-timet x (a- x a The above reaction is the est order reaction We know that the rate constant (K) is. given by K= 2.303 log 2 x K = 0.013051 = initial concentration CO3 = 0.680 M a= more of- H2CO3 reacted, t 685 K= 2.303 log a a 0.013 0 = 2.363 0.680 68 (0.680-2 log 0.680 (0.680-2) 0.0130 0.0339 0.680 (0-680-) 0.3835 10 0.680 (0.680-2) = 2.918 % (0.680-) 0.680 2 .418 = 0.281 concentration Hacoz offer 68 second later is 0.281 M.

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