onsider the reaction: 3A → 4C Initially, and at some fixed temperature, the reaction proceeds at such a rate that 200 millimoles of A are consumed in 1 minute and 47 seconds. The reaction takes place in 1.00 L. a. Express the rate of the reaction as a function of the rates of appearance and disappearance of A and C. b. Find the initial rate of the
Consider the reaction: 3A → 4C
Initially, and at some fixed temperature, the reaction proceeds at such a rate that 200 millimoles of A are consumed in 1 minute and 47 seconds. The reaction takes place in 1.00 L.
a. Express the rate of the reaction as a function of the rates of appearance and disappearance of A and C.
b. Find the initial rate of the reaction.
Experimental data are expressed in the table below.
| t (s) | [A], M |
|---|---|
| 0.00 | 4.20 |
| 10.0 | 3.20 |
| 20.0 | 2.45 |
| 30.0 | 1.87 |
| 40.0 | 1.42 |
| 50.0 | 1.09 |
f. Find the period of time between the 7th half-life and 8th half-life.
h. What will be the time when 37.0% of A will have reacted (t37%)?
i. What will be the concentration of [C] at t37%?
A decomposes thermally, it is observed that k varies as : (No calculations are needed for this part)
| k (s-1) | T (K) |
|---|---|
| 5.10 x 10-3 | 302 |
| 2.60 x 10-2 | 451 |
| 3.10 x 10-2 | 479 |
| 4.10 x 10-2 | 528 |
l. Explain why k increases when we increase the temperature.
m. If, for the same reaction, at a particular temperature, we were to add a catalyst, would Ea, A, k and v be larger, smaller, equal? Explain.
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