Quiz 2 Preparation Q6

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Jessica Kim 1C
Posts: 2
Joined: Fri Sep 25, 2015 3:00 am

Quiz 2 Preparation Q6

Postby Jessica Kim 1C » Wed Feb 17, 2016 2:55 pm

In the question, the initial rate (1.0*10^-3 mole/L/s), reaction constant k (0.50*10^-3 L mole/s), molecular weight (50 g/mole), and volume of the flask (500ml) in which the molecule was put in to react are given. How do you manipulate these values to calculate the initial amount of the molecule in grams?

I am having difficulty manipulating the calculations to obtain a certain unit as the answer.

haleyf 2I
Posts: 12
Joined: Fri Sep 25, 2015 3:00 am

Re: Quiz 2 Preparation Q6

Postby haleyf 2I » Wed Feb 17, 2016 4:31 pm

Given the units of the rate constant, you can tell that the reaction is second order. You can then use rate=k[A]^2 to find the initial concentration of the molecule and then use the volume and molecular weight to find the mass of the sample.

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