CH 102 Spring 2026 – Discussion Worksheet 4 Name: ________________________________________
1. [Based on McQuarrie 17–7] Consider the 2 O3(𝑔) ⟶ 3 O2(𝑔)
a. At one point, ∆PO3/∆t was found to be –5.0 × 10–4 bar/s. What does the negative sign tell you about the reaction?
b. What is the rate of change of oxygen gas pressure in bar/s?
c. What is the rate of the reaction?
d. The gases are reacting in a container that is 12.5 L in volume at 315 K. What is the rate of the reaction in M/s?
2. [McQuarrie 17–5] The rate law for the reaction described by O3(𝑔) + NO(𝑔) ⟶ O2(𝑔) + NO2(𝑔) at 310 K is
Rate = (3.0 × 106 M–1s–1)[O3][NO]. Given that [O3] = 6.0 × 10–4 M and [NO] = 4.0 × 10–5 M at t = 0, calculate the rate
of the reaction at t = 0. What is the overall order of this reaction?
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1. [Based on McQuarrie 17–7] Consider the 2 O3(𝑔) ⟶ 3 O2(𝑔)
a. At one point, ∆PO3/∆t was found to be –5.0 × 10–4 bar/s. What does the negative sign tell you about the reaction?
b. What is the rate of change of oxygen gas pressure in bar/s?
c. What is the rate of the reaction?
d. The gases are reacting in a container that is 12.5 L in volume at 315 K. What is the rate of the reaction in M/s?
2. [McQuarrie 17–5] The rate law for the reaction described by O3(𝑔) + NO(𝑔) ⟶ O2(𝑔) + NO2(𝑔) at 310 K is
Rate = (3.0 × 106 M–1s–1)[O3][NO]. Given that [O3] = 6.0 × 10–4 M and [NO] = 4.0 × 10–5 M at t = 0, calculate the rate
of the reaction at t = 0. What is the overall order of this reaction?
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