Favorable physical conditions

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Ai-nhi Tran 3A
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Favorable physical conditions

Postby Ai-nhi Tran 3A » Sun Nov 15, 2015 5:59 pm

How do you determine which physical conditions will favor the production of the reactants or products given only the equation of the reaction?
I.e. Given the reaction Br2(g) in equilibrium with 2Br(g)
what physical conditions favor the production of bromine atoms?

Jonathan Shih 3H
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

Re: Favorable physical conditions

Postby Jonathan Shih 3H » Sun Nov 15, 2015 7:04 pm

Hi there! Given the equation already at a state of equilibrium, you essentially look at any change in pressure when looking at how the equilibrium would shift at different conditions. If pressure within the closed environment/container increased, the equation would shift to produce the molecule rather than the 2 atoms because if you visualize the gases, the molecule takes up less space. On the other hand, if the pressure decreased, in order to compensate of the lack of pressure more moles of gas would be produced by shifting the equilibirum to produce the 2 gas atoms. Given this idea, any physical conditions just have to be related to pressure of this type of different-numbers-of-molecules type of question. For example, if temperature increases, you can look at the equation PV=nRT, in which the increase in temperature would result in a increase in pressure. A decrease in volume with moles and temperature constant would result in an increase in pressure, and so on. I hope this helps!
-Jonathan


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