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Problems about reaction n 4) The rate law for the substitution of NH3 for H20 in the following reaction is first order in Ni(H2O and zero order in NH3 Ni(H2O)62 + (aq) + NH3(aq) → Ni(H2O)s(NH3)2+ (aq) + H2O (1) Show that the following mechanism is consistent with the experimental rate law. Ni(H2O)62+ (aq) → Ni(H2O)S2+ (aq) +H2O(l) (slow) Ni(H2O),» (aq) + NH3 (aq) → Ni(H2O)5(NH3)2+(aq) (fast)

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Answer #1

we know that rate always depends on the slowest step in the mechanism

in the given slowest step is

Ni(H2O)62+ --------------------> Ni(H2O)52+ + H2O

rate = k [Ni(H2O)62+]

in the rate equation only Ni(H2O)62+ involved and order with respect to Ni(H2O)62+ is 1 . there is no NH3 is involved in the reaction so order with respect to NH3 is zero

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