InterviewSolution
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InterviewSolution
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Determine the order of following reactions from their rate expressions :(a) 2H2O2 → 2H2O + O2 Rate = k [H2O2](b) NO2 + CO → NO + CO2 Rate = k [NO2]2(c) 2NO + O2 → 2NO2 Rate = k [NO]2 x [O2](d) CHCl3(g) + Cl2(g) → CCl4(g) + HCl(g) Rate = k [CHCl3] [Cl2] |
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Answer» (a) For the reaction, 2H2O2 → 2H2O + O2 Since the rate law expression given is, Rate = k [H2O2] Hence, The reaction is of first order. (b) For the reaction, NO2 + CO → NO + CO2 Since the rate law given is Rate = k [NO2]2, The reaction is second order with respect to NO2 and zero order with respect to CO. Hence the net order of the reaction is, n = nNO2 + nco = 2 + 0 = 2 (c) For the reaction, 2NO + O2 → 2NO2 Since the rate law expression given is, Rate = k[NO]2 x [O2] The reaction is second order with respect to NO and first order with respect to O2. Hence, The overall order of reaction is n = nNO2 + no2 = 2 + 1 = 3. (d) For the reaction, CHCl3(g) + Cl2(g) → CCl4(g) + HCl(g) By rate law, Rate = k [CHCl3] [Cl2] Reaction is first order with respect to CHCl3 and first order with respect to Cl2. Hence, The overall order is, n = ncHcl3 + ncl2 = 1 + 1 = 2. |
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