1. Consider the decomposition of NO2 (shown below). The reaction is second order in NO2 with k = 0.543 M-1s-1. If the initial concentration of NO2 in a closed vessel is 0.0500 M, what is the remaining concentration after 15.0 min? 2 NO2 (g) → 2 NO (g) + O2 (g)
1. Consider the decomposition of NO2 (shown below). The reaction is second order in NO2 with k = 0.543 M-1s-1. If the initial concentration of NO2 in a closed vessel is 0.0500 M, what is the remaining concentration after 15.0 min?
2 NO2 (g) → 2 NO (g) + O2 (g)
2. The decomposition of a certain insecticide in water follows first-order kinetics with a rate constant of 1.45 yr-1. A quantity of this insecticide is washed into a lake on June 1, 2021, leading to a concentration of 5.0 x 10-7 g/cm3.
Answer the next 3 questions based on this information.
1. What is the concentration (in g/cm3 ) of the insecticide on June 1 of 2023?
2. How many days will it take for the concentration of the insecticide to decrease to 3.0 x 10-7 g/cm3?
3. Calculate half-life (in days) for the decomposition of this insecticide
3.The decomposition of dimethyl ether, (CH3)2O at 510º C is a first-order process with a rate constant of 6.8 x 10-4 s-1.
(CH3)2O (g) → CH4 (g) + H2 (g) + CO (g)
If the initial pressure of (CH3)2O is 135 mmHg, what is its pressure after 1500 s?
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