# Determine the overall orders of the reactions to

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5.Determine the overall orders of the reactions to which the following rate laws apply: (8 points)
2
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6.What is the half-life of a compound if 75 percent of a given sample of the compound decomposes in 60 minutes? Assume first-order kinetics. (5 points)
7.The thermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction:4PH3(g) → P4(g) + 6H2(The half-life of the reaction is 35.0 s at 680°C. Calculate (a) the first-order rate constant for the reaction and (b) the time required for 95 percent of the phosphine to decompose. (10 points)g)
8.The rate constant for the second-order reaction2NOBr(g) → 2NO(g) + Br2(gis 0.80/M · s at 10ºC. 1.Starting with a concentration of 0.086 M, calculate the concentration of NOBr after 22 s. (5 points))
2.Calculate the half-lives when [NOBr]
.
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