Rates Solutions Page 1

Rates of Reaction – Part A Solution

  1. Given the reaction CO + NO2 → CO2 + NO (All reactants and products are gases)

All of the gases are colorless except for NO2 which is reddish brown.

a) Define the overall rate of reaction in terms of:

(1) The differential rate of consumption of CO = R1

rates 02

(2) The differential rate of consumption of NO2 = R2

rates 03

(3) The differential rate of production of CO2 = R3

rates 04

(4) The differential rate of production of NO = R4

rates 05



(b) What is the mathematical relationship between R1, R2, R3 and R4?

rates 01

(c) Which of the four species in this reaction would be the best choice for determining the rate of reaction? Explain your choice.

NO2 is a reddish brown gas. The intensity α [NO2] or we can say that intensity changes with time

  1. Which reaction(s) are likely to be rapid at room temperature? Give reasons for each choice.

(1) C8H18(l) + 12 ½ O2(g) → 8CO(g) + 9H2O(g)

(2) Cr2+(aq) + Fe3+(aq) → Cr3+(aq) + Fe2+(aq)

(3) Ag+(aq) + I(aq) → AgI(s)

(4) 3Fe2+(aq) + NO3(aq) + 4H+(aq) → 3Fe3+(aq) + NO(aq) + 2H2O(l)

2 and 3 are ionic reactions hence should be extremely fast. They are precipitation reactions. Ionic reactions

1 and 4 involves extensive bond rearrangements as they involve covalent bonds

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