4. The decomposition of SO2Cl2 is a first-order reaction: SO2Cl2 (g) → SO2 (g) + Cl2 (g). A 1.24 × 10–3 M sample of SO2Cl2 drops to 3.1 × 10−4 M after 495 min. a. What is the value of the rate constant, k?

b. What is the half-life for this reaction?

5. Gaseous azomethane, C2H6N2, decomposes according to the following equation:

C2H6N2 (g) → N2 (g) + C2H6 (g)

A 2.00 g sample if azomethane is placed in a flask at 425°C and the amount that

remain is recorded in the table shown.

a. Provide evidence for why this process is first-order.

b. Find the value for the rate constant, k. Include units.

c. After how much time will only 0.050 g remain?

6. Consider the decomposition of nitrogen dioxide, NO2: 2 NO2(g) → 2 NO(g) + O2(g)

a. Find the rate law for this reaction.

b. Find the value of the rate constant k. Include units.

c. In trial 2, how long will it take for [NO2] to reach 0.002 M?