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Volume decrease

Posted: Sun Feb 09, 2020 7:32 pm
by Hannah_1G
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.

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:07 pm
by Maia_Jackson_2C
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?

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:18 pm
by Areli C 1L
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.

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:33 pm
by Matthew ILG 1L
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.

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:36 pm
by Kate Osborne 1H
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

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:39 pm
by zfinn
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.

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:41 pm
by PranaviKolla2B
Can someone explain what it means when the reaction shifts one way or another?

Re: Volume decrease

Posted: Sun Feb 09, 2020 8:44 pm
by J Medina 2I
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.