Reaction Coefficient, Q

$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$

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ryan_macdougall_3B_2C
Posts: 4
Joined: Wed Sep 21, 2016 2:57 pm

Reaction Coefficient, Q

On page 431 of the textbook it introduces the formula for the reaction coefficient:
Q = [(a subC)^c x (a subD)^d]/ [(a subA)^a x (a subB)^b] . What does this equation tell us, when is it useful, and what do the variables stand for? The book did not explain this well.

Thu Uyen Tran 1B
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

Re: Reaction Coefficient, Q

Q, in comparison to K, tells us whether reaction is favors the products or reactants. When Q>K, the reaction favors reactants. When Q<K, the reaction favors the products. It's basically products/reactants, each component raised to the number of moles in the chemical formula.

Max Mazo 2C
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

Re: Reaction Coefficient, Q

The lowercase letters a, b, c, and d all refer to the molar coefficients of each part of the reaction, and the upper case letters A, B, C, and D refer to the components of the reaction, with C and D as products and A and B as reactants.

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