(a)
Interpretation:
The unit of rate constant for the zero order reactionhas to be determined.
Concept Introduction:
According to the rate law, the rate of the reaction is directly proportional to the initial concentration of the reactant of the reaction. The overall order of the reaction is the sum of the order of all the reaction in the
(b)
Interpretation:
The unit of rate constant for the first order reaction has to be determined.
Concept Introduction:
Same as part (a).
(c)
Interpretation:
The unit of rate constant for the second order reaction has to be determined.
Concept Introduction:
Same as part (a).
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Chemical Principles: The Quest for Insight
- The hydrolysis of the sugar sucrose to the sugars glucose and fructose, C12H22O11+H2OC6H12O6+C6H12O6 follows a first-order rate equation for the disappearance of sucrose: Rate =k[C12H22O11] (The products of the reaction, glucose and fructose, have the same molecular formulas but differ in the arrangement of the atoms in their molecules.) (a) In neutral solution, k=2.11011s1 at 27 C and 8.51011s1 at 37 C. Determine the activation energy, the frequency factor, and the rate constant for this equation at 47 C (assuming the kinetics remain consistent with the Arrhenius equation at this temperature). (b) When a solution of sucrose with an initial concentration of 0.150 M reaches equilibrium, the concentration of sucrose is 1.65107M . How long will it take the solution to reach equilibrium at 27 C in the absence of a catalyst? Because the concentration of sucrose at equilibrium is so low, assume that the reaction is irreversible. (c) Why does assuming that the reaction is irreversible simplify the calculation in pan (b)?arrow_forwardExplain why half-lives are not normally used to describe reactions other than first order.arrow_forwardIf a reaction has the same rate constant, what time does it take for a reactant to decrease by 5 that is, still near the beginning of the reaction process if the kinetics are zeroth-order, first-order, and second-order with respect to that reactant?arrow_forward
- Three first-order reactions have the following activation energies: (a) Which reaction is the fastest? (b) Which reaction has the largest half-life? (c) Which reaction has the largest rate?arrow_forwardFor the reaction 5Br(aq)+BrO3(aq)+6 H+(aq)3Br2(aq)+3H2O It was found that at a particular instant, bromine was being formed at the rate of 0.029 mol/L s. At that instant, at what rate (a) are the hydrogen ions being consumed? (b) is water being formed? (c) are the bromide ions being consumed?arrow_forwardDerive an expression for the half-life of a a third order reaction;b a reaction whose order is =1; c a reaction whose order is 12. In these last two cases, examples are rare but known.arrow_forward
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