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rain Login o x i MindTap Cengage Lea x ilindex.html?nbld 569305&nbNodeld; 206185416&elSBNs9781305657571; 18 parentld 206185477 The gasphase reaction between hydrogen and iodine is proposed to occur as follows: step fast 21 step 2 slow: H: 21 2 HI ()What is the equation for the overall reaction? Use the smallest integer coeficients possible. If a box is not nee Use the fomklAlmIBI .where l'isunderstood (so don't write itifits a l') form, n etc. Rate m hamisms Second Step Slow This is group attempt 1 of5

Explanation / Answer

1)Overall reaction is sum of fast step and slow step

That is step 1 +step 2

I2 + H2 + 2 I ---------> 2 I + 2 HI

Cancel 2 I on both sides, then we get

I2 + H2 ---------> 2 HI { This is the overall reaction }

2)

There is no catalyst in the reaction.

All species involved in both steps participate in reaction. A catalyst is a species which speed up the reaction and also remains unchanged at the end of reaction.

3)

Intermediate is I.

Intermediates are short-lived species which are formed during the course of reaction. Here it is I (iodine atom).

4)

Rate of a reaction is the rate of slow step.That is slow step is the rate determining step.

So rate of reaction is based on

H2 + 2 I ---------> 2 HI

r = K [ H2 ] [I]2

Rate is proportional to the product of concentration of reactant s raised to their stoichiometry in the rate determining step.

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