At a certain temperature this reaction follows second-order kinetics with a rate

Question

At a certain temperature this reaction follows second-order kinetics with a rate constant of 0.0614·M1s1:

2HIg+H2gI2g

Suppose a vessel contains HI at a concentration of 1.39M. Calculate the concentration of HI in the vessel 50.0 seconds later.

You may assume no other reaction is important. Round your answer to 2 significant digits.

At a certain temperature this reaction follows second-order kinetics with a rate constant of 0.0614M-, s-, 2H1(g) H2 (g) +1 Suppose a vessel contains HI at a concentration of 1.39 M. Calculate the concentration of HI in the vessel 50.0 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. x 10

Explanation / Answer

we have:

[HI]o = 1.39 M

t = 50.0 s

k = 6.14*10^-2 M-1.s-1

we have:

[HI]o = 1.39 M

use integrated rate law for 2nd order reaction

1/[HI] = 1/[HI]o + k*t

1/[HI] = 1/(1.39) + 6.14*10^-2*50

1/[HI] = 0.7194 + 6.14*10^-2*50

1/[HI] = 3.7894

[HI] = 0.2639 M

Answer: 0.26 M

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