How do I do these two problems? Thank you very much! 2. What would happen to the

Question

How do I do these two problems? Thank you very much! 2. What would happen to the reaction time if, instead of 0,.001 M S,0, you were to use 0.002 M S0, instead? Explain. What would happen to the reaction rate? Explain. 3. An experiment provides the following rate data: Write a rate expression for this reaction, include in this A) Rate 2.0 10 2.0 10 2.162.0 10 4.0*10 6.0 10 expression the values for the reaction order and the values for the rate constant (including units). 0.15 0.15 0.15 0.30 0.45 0.72 1.44 0.72 0.72

Explanation / Answer

2.

Increase in concentration will increase the rate of reaction and hence decrease the reaction time.

3.

General rate law expression,

Rate = k[A]m[B]n

Do, (1) / (2)

2.0 * 102 / ( 2.0 * 102 ) = [0.72 / 1.44]n

1 = (0.5)n

(0.5)0 = (0.5)n

n = 0

So, the order of reaction with respect to B = 0

Do, (4) / (5)

4.0 * 102 / ( 6.0 * 102 ) = [0.30 / 0.45]m

(0.67)1 = ( 0.67 )m

m = 1

So, the order with respect to A = 1

Over all order of reaction = 0 + 1 = 1

Rate law expression can be written as,

Rate = k[A]

From (1) =>

2.0 * 102 = k(0.15)

k = 1.33 * 103 s-1

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