Chemical Kinetics

Consider the following data for the given reaction 2HI(g) H2(g) + I2(g) [figure] The order of the reaction is .

Answer

2

Solution

Rate = k[HI]n

Experiments 1 and 2: 3.0 10-37.5 10-4 = ( 0.010.005 )n

⇒ 4 = 2n ⇒ n = 2

(Experiments 2 and 3: [HI] doubles, rate becomes 4 times — same result)

Answer: 2