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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: appleseed on June 09, 2009, 09:58:16 AM

Title: How to find Kc value?
Post by: appleseed on June 09, 2009, 09:58:16 AM

The equation for another reaction used in industry is:
CO(g) + H2O(g)   H2(g) + CO2(g)   DHӨ = -42 kJ
2.0 mol of carbon monoxide and 3.2 mol of steam were left to reach equilibrium. At equilibrium, 1.6 mol of both hydrogen and carbon dioxide were present.

I've worked out already that Kc for this reaction is 4.00 and im sure that its correct so here's the question:

Under the same conditions of temperature and pressure, 2.0 mol of carbon monoxide and 2.0 mol of steam were left to reach equilibrium.
Calculate the amounts of each reactant and product at equilibrium.


hmm i dont know what to do because i dont have the equilibrium concentrations of CO and H2O and i only have Kc



Thankyou !!

Title: Re: How to find Kc value?
Post by: sjb on June 09, 2009, 01:06:33 PM

A Kc of 4.0 does not sound right for that equation, can you show your working?

Look into ICE tables and similar