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college chemistry

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The rate of the following reaction:
2 NO2 2 NO + O2,
is characterized by the rate constant k = 0.775 L·mol-1s-1. What is the half-life for this reaction at the same conditions when the initial concentrations are 0.0115 M? (Round your answer to 3 significant figures.)
Hint: The units of the rate constant are linked with the order of reaction.

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    Here is a site that lists the units of the order. Scroll about half way down the page to see this is a second order equation. Then look in your text for the integrated form (the site also shows the formula), substitute the numbers from the problem and solve. The site even has the NO2 problem (but not your numbers) as an example.

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