mole ratio with solids

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Emily Glaser 1F
Posts: 156
Joined: Thu Jul 27, 2017 3:01 am

mole ratio with solids

Postby Emily Glaser 1F » Sat Dec 09, 2017 12:33 pm

Do I use mole ratio when solids are in equation to determine which way it will favor.

Example,
A(s) <--> B(g) + C(g)

If volume is decreased, would I say the reaction favors reactants because mole ratio is (0:2)

Zane Mills 1E
Posts: 80
Joined: Fri Sep 25, 2015 3:00 am
Been upvoted: 1 time

Re: mole ratio with solids

Postby Zane Mills 1E » Sat Dec 09, 2017 12:41 pm

yes, just as when you're calculating eq constants, change in pressure/conc doesn't impact solids or gasses, thus you only take into account the gasses that are compressed by increase in pressure/decrease in volume. (moving it to the left after you calculate Q)
Last edited by Zane Mills 1E on Sat Dec 09, 2017 3:38 pm, edited 1 time in total.

Emily Mei 1B
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: mole ratio with solids

Postby Emily Mei 1B » Sat Dec 09, 2017 12:50 pm

Emily Glaser 1F wrote:Do I use mole ratio when solids are in equation to determine which way it will favor.

Example,
A(s) <--> B(g) + C(g)

If volume is decreased, would I say the reaction favors reactants because mole ratio is (0:2)


I would say that if the volume is decreased, it means the molarity of the products goes up, so Q goes up. If Q > K, then the reaction shifts left/favors reactants.


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