1. A certain reaction has the form aA → Products At a particular temperature, concentration versus time data were collected. A plot of [A] vs t (in seconds) gave a straight line with a slope of -6.90 × 10-2. If [A]o for this reaction is 0.100 M, calculate the first half-life (in seconds). seconds =     2. A certain reaction has the form aA → Products At a particular temperature, concentration versus time data were collected. A plot of ln[A] vs t (in seconds) gave a straight line with a slope of -6.90 × 10-2. If the original concentration (at t = 0) is 0.100 M, calculate the second half-life (in seconds) for this experiment. s=   3.For the decomposition of dinitrogen pentoxide in carbon tetrachloride solution at 30 °C 2 N2O54 -->NO2 + O2 the average rate of disappearance of N2O5 over the time period from t = 0 min to t = 137 min is found to be 1.62×10-3 M min-1. The average rate of formation of O2 over the same time period is  ---M min-1.   4. For the decomposition of nitrosyl bromide at 10 °C 2 NOBr2 NO + Br2 the average rate of disappearance of NOBr over the time period from t = 0 s to t = 9 sis found to be 1.81×10-2 M s-1. The average rate of formation of Br2 over the same time period is       ------M s-1.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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1. A certain reaction has the form

aA → Products

At a particular temperature, concentration versus time data were collected.
A plot of [A] vs t (in seconds) gave a straight line with a slope of -6.90 × 10-2.

If [A]o for this reaction is 0.100 M, calculate the first half-life (in seconds).

seconds =

 

 

2. A certain reaction has the form

aA → Products

At a particular temperature, concentration versus time data were collected.
A plot of ln[A] vs t (in seconds) gave a straight line with a slope of -6.90 × 10-2.

If the original concentration (at t = 0) is 0.100 M, calculate the second half-life (in seconds) for this experiment.

s=

 

3.For the decomposition of dinitrogen pentoxide in carbon tetrachloride solution at 30 °C


2 N2O54 -->NO2 + O2

the average rate of disappearance of N2O5 over the time period from t = 0 min to t = 137 min is found to be 1.62×10-3 M min-1.

The average rate of formation of O2 over the same time period is  ---M min-1.
 

4. For the decomposition of nitrosyl bromide at 10 °C

2 NOBr2 NO + Br2

the average rate of disappearance of NOBr over the time period from t = 0 s to t = 9 sis found to be 1.81×10-2 M s-1.

The average rate of formation of Br2 over the same time period is       ------M s-1.
 
 

 

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