1. At 25°C the rate constant for the first-order decomposition of a pesticide so
ID: 497067 • Letter: 1
Question
1. At 25°C the rate constant for the first-order decomposition of a pesticide solution is 1.50 * 10–3 min–1. If the starting concentration of pesticide is 0.750 M, what concentration will remain after 62.0 min at 25°C?
2.
Nitric oxide gas (NO) reacts with chlorine gas according to the chemical equation given below.
NO + Cl2 NOCl
The following initial rates of reaction have been measured for the given reagent concentrations. Determine the rate law of this reation?
Expt. #
Rate (M/hr)
NO (M)
Cl2 (M)
1
1.19
0.50
0.50
2
4.79
1.00
0.50
3
9.59
1.00
1.00
Expt. #
Rate (M/hr)
NO (M)
Cl2 (M)
1
1.19
0.50
0.50
2
4.79
1.00
0.50
3
9.59
1.00
1.00
Explanation / Answer
1)
use integrated rate law for 1st order reaction:
ln [A] = –kt + ln [A]o
ln [A] = -(1.50*10^-3 * 62.0) + ln (0.750)
ln [A] = -0.381
[A] = 0.683 M
Answer: 0.683 M
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