## 15.23 c) HW

904940852
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

### 15.23 c) HW

how would I solve 15.3 part C?

Ashin_Jose_1H
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Re: 15.23 c) HW

I'm not sure if you are referring to 15.23 or 15.3, but here is 15.23.

In order to find the rate constant, we will use the formula ln($\frac{[A][sub]0]}{[A][sub]t]}$) =kt, and solve for k.

We know the initial concentration of A, but we need to find the concentration of A at time 115s.
This final concentration would be = the initial concentration - the concentration at time 115s.

We know that at 115s, the concentration of B is 0.034. Since two moles of A is consumed to produce one mole of B, we can multiply that by 2 to get the concentration of A at 115s. Subtract the initial concentration and the concentration at time 115s (of A), to get the final concentration. Plug them into the formula above, and solve for k.

Ashin_Jose_1H
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Re: 15.23 c) HW

Oh and here is 15.3,

To calculate the unique rate of formation for the reaction with reactants aA and bB and cC and dD, where a,b,c, and d are coefficients, calculate one the following
-1/a * delta [A]/delta t. (both a and A can be switched to b and B or c and C respectively) the formula is on page 613 in the Textbook.

In part c, a would be 2, delta [A] would be (130) and delta t would be 20s. Plug into a calculator and solve.