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Zero and Second Order Reaction

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The second order reaction for the decomposition of nitrosyl bromide has a half life of 12.5s at a concentration of 0.100M.

NOBr(g)-->NO(g) + 1/2Br2(g)

I need help finding k for the reaction, and how would I find how long it will take to decompose 80 % of a 0.0500M solution of nitrosyl bromide, and how fast 0.200M solution of nitrosyl bromide will decompose.

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For the second order reactions, you need the right formula

1/[At] - 1/[Ao] = kt

is the one you need to use.

Whenever they ask these types of questions, they usually give the half life of the reaction. Use the half life to find the k and then you are on the right track.

From the definition of ...

Solution Summary

The solution provides an easy-to-follow, step-by-step solution to finding the reaction constant of the given second order equation.

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Lab Report: Reaction Order and Rate Laws

Objective: To study the effect of reactant concentration on the rate of the reaction between sodium thiosulfate and hydrochloric acid and to determine the order of each reactant and the rate law for the reaction.

2 HCI(aq) + NaS2O3 (aq) --> S(s) + SO2 (aq) + H2O(l) + 2NaCL(aq)


(a) Calculate the initial and final concentrations as needed to complete tables 1 and 2.
(b) Calculate the average reaction time for each reaction by adding the times for the two trials and dividing by 2.
(c) Calculate the reaction rate by taking the inverse of the average reaction time.
(d) Write the rate law for the reaction.

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