Volume decrease

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Hannah_1G
Posts: 100
Joined: Wed Sep 18, 2019 12:22 am

Volume decrease

Postby Hannah_1G » Sun Feb 09, 2020 7:32 pm

I thought the rule for volume decrease is that the side with less moles will be favored; however, in 5.39 the volume was halved and the reactant which has more moles in equation, I calculated it to have increased in concentration.

Maia_Jackson_2C
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Volume decrease

Postby Maia_Jackson_2C » Sun Feb 09, 2020 8:07 pm

The rule is that the reaction will favor the side with less moles of gas for a volume decrease, you didn't mention gases so maybe the moles you counted weren't for gases?

Areli C 1L
Posts: 95
Joined: Wed Nov 14, 2018 12:19 am

Re: Volume decrease

Postby Areli C 1L » Sun Feb 09, 2020 8:18 pm

Maia_Jackson_2C wrote:The rule is that the reaction will favor the side with less moles of gas for a volume decrease, you didn't mention gases so maybe the moles you counted weren't for gases?

This. Little details like these are the real kickers. Hope you figured it out OP.

Matthew ILG 1L
Posts: 112
Joined: Sat Aug 17, 2019 12:15 am

Re: Volume decrease

Postby Matthew ILG 1L » Sun Feb 09, 2020 8:33 pm

The rule of less moles only applies when you are dealing with gases. If the substances in the rxn are not gases, then I do not believe the rule applies.

Kate Osborne 1H
Posts: 102
Joined: Fri Aug 30, 2019 12:16 am

Re: Volume decrease

Postby Kate Osborne 1H » Sun Feb 09, 2020 8:36 pm

This rule only applies when gases are present, if the system only has solids or liquids then a change in volume would not shift the equilibrium because compressing solids and liquids does not make them react more/less

zfinn
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

Re: Volume decrease

Postby zfinn » Sun Feb 09, 2020 8:39 pm

the rxn will favor the side with less moles of gas, although Dr. Lavelle mentioned that this rule is a quick sub for what is actually happening due to changes in concentration.

PranaviKolla2B
Posts: 114
Joined: Fri Aug 30, 2019 12:17 am

Re: Volume decrease

Postby PranaviKolla2B » Sun Feb 09, 2020 8:41 pm

Can someone explain what it means when the reaction shifts one way or another?

J Medina 2I
Posts: 102
Joined: Wed Sep 25, 2019 12:17 am

Re: Volume decrease

Postby J Medina 2I » Sun Feb 09, 2020 8:44 pm

PranaviKolla2B wrote:Can someone explain what it means when the reaction shifts one way or another?

A reaction shifts left when reactants are being produced at a higher rate than products and a reaction that shifts right means that products are being formed at a higher rate than the reactants.


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