± Introduction to Reaction Rates (2) Learning Goal: To calculate average and rel

Question

± Introduction to Reaction Rates (2)

Learning Goal:

To calculate average and relative reaction rates.

Reaction rate can be defined either as the increasein 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=1/2(rate of Y)

Each rate can be expressed as the change in concentration over the change in time, t:

[X]/t=1/2([Y]t)

8.00×103

Part A

Determine the average rate of decomposition of H3PO4 between 10.0 and 40.0 s.

Express your answer with the appropriate units.

Part B

What is the average rate of consumption of H+ 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 1.40×103 4.40×103 6.20×103 7.40×103

8.00×103

Explanation / Answer

A)

For Rate of decomposition

dH3PO4 / dT = ( (7.4*10^-3) - (1.4*10^-3) ) / (40-10) = 0.0002 M/s

B)

average consumption of H+ in same interval

so... this is average, then we can assume the value in A is valid

so..

relate

H3PO4 = 3H+

so

rate of H+ is 3 times more than the H3PO4

so

Rate [H+] = 3*0.0002 M/s

Rate [H+] = 0.0006 M/s

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.