1. Find the overall reaction of these three steps:

Question

1. Find the overall reaction of these three steps:
IBr(g) -> I(g) + Br(g)
IBr(g) + Br(g) -> I(g) + Br2(g)
I(g) + I(g) -> I2(g)

Answer 1

IBr(g) -> I(g) + Br(g) 
IBr(g) + Br(g) -> I(g) + Br2(g) 

I(g) + I(g) -> I2(g) 

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2IBr ==> Br2 + I2

overal order = 2nd order