± Introduction to Reaction Rates Learning Goal: To calculate average and relativ

Question

± Introduction to Reaction Rates Learning Goal: To calculate average and relative reaction rates. You can measure the rate of a reaction, just like you can measure the speed a jogger runs. While a jogger would be reported to run a specific number of miles in an hour, miles/hour, a reaction is reported to form product or consume reagent in molar concentration per second, M/s. Reaction rate can be defined either as the increase in the concentration of a product per unit time or as the decrease of the concentration of a reactant per unit time. By definition, reaction rate is a positive quantity. In the reaction X2Y, for example, Y is being produced twice as fast as X is consumed and thus rate of X=12(rate of Y) Each rate can be expressed as the change in concentration over the change in time, t: [X]t=12([Y]t)

Part A

Consider the reaction

2H3PO4P2O5+3H2O

Using the information in the following table, calculate the average rate of formation of P2O5 between 10.0 and 40.0 s.

Express your answer with the appropriate units.

Part C

Consider the reaction

5Br(aq)+BrO3(aq)+6H+(aq)3Br2(aq)+3H2O(l)

The average rate of consumption of Br is 2.06×104M/s over the first two minutes. What is the average rate of formation of Br2 during the same time interval?

Express your answer with the appropriate units.

Time (s) 0 10.0 20.0 30.0 40.0 50.0 [P2O5] (M) 0 1.70×103 4.70×103 6.50×103 7.70×103 8.30×103

Explanation / Answer

Part A

Consider the reaction

2H3PO4P2O5+3H2O

Using the information in the following table, calculate the average rate of formation of P2O5 between 10.0 and 40.0 s.

Express your answer with the appropriate units.

Rate of formation of P2O5 = molal of P2O5 at 50s - molal of P2O5 at 10 s / (50-10)=

(8.3-1.7)*10-3/40 = 1.65*10-4 M/s

Part C

Consider the reaction

5Br(aq)+BrO3(aq)+6H+(aq)3Br2(aq)+3H2O(l)

The average rate of consumption of Br is 2.06×104 M/s over the first two minutes. What is the average rate of formation of Br2 during the same time interval?

Express your answer with the appropriate units.

Time (s) 0 10.0 20.0 30.0 40.0 50.0 [P2O5] (M) 0 1.70×103 4.70×103 6.50×103 7.70×103 8.30×103

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