The following mechanism has been proposed for the gas-phase reaction of H2 with

Question

The following mechanism has been proposed for the gas-phase reaction of H2 with ICl:
H2(g)+ICl(g)HI(g)+HCl(g)HI(g)+ICl(g)I2(g)+HCl(g)

b)Identify any intermediates in the mechanism?

c)Write rate laws for each elementary reaction in the mechanism?Use a for [H2], b for [ICl] and k1 for the rate constant.

d)Use c for [HI], d for [ICl] and k2 for the rate constant?

e)If the first step is slow and the second one is fast, what rate law do you expect to be observed for the overall reaction? Use a for [H2], b for [ICl], c for [HI], d for [ICl], k for the rate constant.

Explanation / Answer

b)

H2(g)+ICl(g)HI(g)+HCl(g)

HI(g)+ICl(g)I2(g)+HCl(g)

HI is an intermediate, since it is not in the reactants and products

c)

H2(g)+ICl(g)HI(g)+HCl(g)

Rate1 = k1*H2*ICI

HI(g)+ICl(g)I2(g)+HCl(g)

Rate2 = k2*HI*ICl

e)

the total rate is always of the slowest step therefore

H2(g)+ICl(g)HI(g)+HCl(g)

Rate1 = k1*[H2]*[ICI}

note that Rate1 = Overall Rate

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.