The vapor of nitrogen triiodide, NI3(g), decomposes upon heating into nitrogen gas, N2(g), and iodine vapor, I2(g). This reaction may occur by the following gas-phase mechanism.

1) NI3 → NI2 + I (slow)

2) NI2 + I→ NI + I2 (fast)

3) 2NI → N2I2 (fast)

4) N2I2 → N2 + I2 (fast)

a) Write a balanced reaction equation for the decomposition of NI3(g) into N2(g) and I2(g).

b) Simple addition of steps 1-4 will not give you the reaction equation you should have written in part (a). Which steps should occur multiple times to account for the stoichiometry of the process? How many times each?

c) What is the expected rate law for the overall decomposition reaction based on the above mechanism?

d) Why cannot we write 2NI3 → 2NI2 + 2I for the first step in this mechanism? Explain.

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