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Postby manasa933 » Tue Mar 06, 2018 1:29 pm

In part (c), the mass is taken as the concentration because the vessel is sealed. But why is this true?

Grace Ramey 2K
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Re: 15.37

Postby Grace Ramey 2K » Tue Mar 06, 2018 2:21 pm

In this case, the mass can be used in place of the concentration because the conversion to concentration will cancel out in the first order integrated rate law:
ln[A] = -kt + ln[A]o
rewritten as ([A]/[A]o) = e^(-kt)

On the left-hand side, in [A]/[A]o, any conversion factors to mol/L will cancel out, so you can just use the numbers given in terms of grams.

Adrian Lim 1G
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Re: 15.37

Postby Adrian Lim 1G » Tue Mar 06, 2018 3:50 pm

Why can we use the mass in this instead of concentration in this problem?

Laura Riccardelli
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Re: 15.37

Postby Laura Riccardelli » Tue Mar 06, 2018 4:00 pm

I think you can use mass because you would be dividing by the same number of L on both sides so they would cancel anyways.

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