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(i) What is meant by the term "coordination number"? What is the coordination number of atoms in a bcc structure ? (ii) Rate constant k of a reaction varies with temperature T according to the following Arrhenius equation log K = "log A" (E_(a))/(2.303 R) ((1)/(T)) Where E_(a) is the activation energy. When a graph is plotted for log k Vs (1)/(T) a straight line with a slope of -4000 K is obtained. Calculate the activation energy. |
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Answer» Solution :(i) 1. Let us consider the reaction between sodium hydroxide and acetic ACID to GIVE sodium acetate and water. `NaOH_((aq)) + CH_(3)COOH_((aq)) harr CH_(3)COONa_((aq)) + H_(2)O_((l))` 2. Coordination number of atoms in a bcc structure is 8 (ii) `log k = log A - (E_(a))/(2.303 R) ((1)/(T))` y = c + mx `m = - (E_(a))/(2.303 R)` `E_(a) = - 2.303 Rm` `E_(a) =- 2.303 xx 8.314 JK^(-1) MOL^(-1) xx (-4000 K)` `E_(a) = 76,589 J mol^(-1)` `E_(a) = 76.589 "kJ mol"^(-1)` |
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