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doubling pressure

Posted: Sat Jan 12, 2019 9:05 pm
by Ruiting Jia 4D
When talking about Le Chatelier's implications on changing physicial parameters, such as pressure, why did Dr. Lavelle double pressure to find the new initial concentration of the equation : N2 + 3 H2 <=> 2 NH3 ??

Re: doubling pressure

Posted: Sat Jan 12, 2019 9:28 pm
by AngelaZ 1J
Lavelle was giving an example of how a reaction responds to minimize the effect of increasing pressure (by decreasing volume). If P doubled (V halved), then there would be new initial concentrations (since concentration=moles/volume). Q would then be solved for these new concentrations so that we could compare Q to K and see which way the reaction would shift. In this case, Q<K so the reaction would shift to the right.

Re: doubling pressure

Posted: Sat Jan 12, 2019 10:55 pm
by deepto_mizan1H
In addition to the reply above, it is a strong example of how the principle works to rebalance the system (pushing the equilibrium to either direction).