Exercises
20A.1(a) Predict how the total pressure varies during the gas-phase reaction
2 ICl(g)+H2(g)→I2(g)+2 HCl(g) in a constant-volume container.
20A.1(b) Predict how the total pressure varies during the gas-phase reaction
N2(g)+3 H2(g)→2 NH3(g) in a constant-volume container.
20A.2(a) The rate of the reaction A+2 B→3 C+D was reported as
2.7moldm−3 s−1. State the rates of formation and consumption of the
participants.
20A.2(b) The rate of the reaction A+3 B→C+2 D was reported as
2.7moldm−3 s−1. State the rates of formation and consumption of the
participants.
20A.3(a) The rate of formation of C in the reaction 2 A+B→2 C+3 D
is 2.7moldm−3 s−1. State the
consumption of A, B, and D.
20A.3(b) The rate of consumption of B in the reaction A+3 B→C+2 D
is 2.7moldm−3 s−1. State the reaction rate, and the rates of formation or
consumption of A, C, and D.
20A.4(a) The rate law for the reaction in Exercise 20A.2(a) was found to be
v=kr[A][B]. What are the units of kr when the concentrations are in moles per
cubic decimetre? Express the rate law in terms of the rates of formation and
consumption of (i) A, (ii) C.
20A.4(b) The rate law for the reaction in Exercise 20A.2(b) was found to be
v=kr[A][B]2. What are the units of kr when the concentrations are in moles
per cubic decimetre? Express the rate law in terms of the rates of formation
and consumption of (i) A, (ii) C.
20A.5(a) The rate law for the reaction in Exercise 20A.3(a) was reported as
d[C]/dt=kr[A][B][C]. Express the rate law in terms of the reaction rate v;
what are the units for kr in each case when the concentrations are in moles per
cubic decimetre?
20A.5(b) The rate law for the reaction in Exercise 20A.3(b) was reported as
d[C]/dt=kr[A][B][C]−1. Express the rate law in terms of the reaction rate v;
what are the units for kr in each case when the concentrations are in moles per
cubic decimetre?
20A.6(a) If the rate laws are expressed with (i) concentrations in moles per
cubic decimetre, (ii) pressures in kilopascals, what are the units of the secondorder and third-order rate constants?
20A.6(b) If the rate laws are expressed with (i) concentrations in molecules per
cubic metre, (ii) pressures in pascals, what are the units of the second-order
and third-order rate constants?
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