Using the following data, determine the order of the reaction with respect to [NO₂^–].

Data Table for Three Experiments

Experiment	Initial [NH4+]	Initial [NO2]	Initial rate (M/s)
Experiment 1	0.24 M	0.10 M	7.2 × 10-6 M/s
Experiment 2	0.12 M	0.10 M	3.6 × 10-6 M/s
Experiment 3	0.12 M	0.15 M	5.4 × 10-6 M/s

For each of the following gas-phase reactions, indicate how the rate of disappearance of each reactant is related to the rate of appearance of each product:

(d) C₂H₅NH₂(g) → C₂H₄(g) + NH₃(g)

For each of the following gas-phase reactions, write the rate expression in terms of the appearance of each product and disappearance of each reactant:

(a) 2 H₂O(g) → 2 H₂(g) + O₂(g)

(b) 2 SO₂(g) + O₂(g) → 2 SO₃(g)

(c) 2 NO(g) + 2 H₂(g) → N₂(g) + 2 H₂O(g)

(d) N₂(g) + 2 H₂(g) → N₂H₄(g)

Ammonia is manufactured in large amounts by the reaction

N₂(g) + 3 H₂(g) → 2 NH₃(g)

(a) How is the rate of consumption of H₂ related to the rate of consumption of N₂?

The formation of alumina, Al₂O₃, can be illustrated by the reaction below:

4 Al (s) + 3 O₂ (g) → 2 Al₂O₃ (s)

At 750 K it takes 267 seconds for the initial concentration of Al₂O₃ to increase from 6.18 x 10^-5 M to 5.11 x 10^-4 M. What is the average rate of Al?

Step 1: NO₂ + NO₂ → NO₃ + NO    (slow)

Step 2: NO₃ → NO + O₂    (fast)

(a) Consider the combustion of hydrogen, 2 H21g2 + O21g2 ¡ 2 H2O1g2. If hydrogen is burning at the rate of 0.48 mol>s, what is the rate of consumption of oxygen? What is the rate of formation of water vapor?