Question 2 of 12 Map University Science Books Donald McQuarrie Peter A.Rock.Ehan

Question

Question 2 of 12 Map University Science Books Donald McQuarrie Peter A.Rock.Ehan Galogh presented by Sapling Learning The decomposition of N205 can be described by the equation (s) [N205] (M) 2.48 4No, (soln)+ o,(R) 2N, O. soln 135 2.28 436 1.89 Given these data for the reaction at 45°C in carbon tetrachloride solution, 745 calculate the average rate of reaction for each successive time interval. Interval: 0 s to 135 s 135 s to 436 s 436 s to 745 s Number Reaction rate 0.0007 Mis 0.0006 M/ s 0.0005 M/ s Previous Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

Determining the Average Rate from Change in Concentration over a Time Period

We calculate the average rate of a reaction over a time interval by dividing the change in concentration over that time period by the time interval. For the change in concentration of a reactant, the equation, where the brackets mean "concentration of", is

Note: We use the minus sign before the ratio in the previous equation because a rate is a positive number. We do not need the minus sign when calculating average rates from products.

Average Rate = -(2.28 M-2.48M) / (135 sec -0 sec)

Average Rate = -(-0.2/135)

Average rate = 0.0014 M/s

Average rate = 1.4 10-3 M/s

Average Rate = -(1.89 M-2.28M) / (436 sec -135 sec)

Average Rate = -(-0.39/301)

Average rate = 0.0012 M/s

Average rate = 1.2 10-3 M/s

Average Rate = -(1.55 M- 1.89 M) / (745 sec -436 sec)

Average Rate = -(-0.34/309)

Average rate = 0.0011 M/s

Average rate = 1.1 10 -3 M/s

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