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Calculating Values of Equilibrium Constants

Question states:

In the reaction of ammonium chloride (as a solid) dissociating to produce ammonia and hydrogen chloride (both as gases), the equilibrium concentration of each product was found to be 3.71x10^-3 (they each have the same concentration, ammonia is 3.71x10^-3 and hydrogen chloride is 3.71x10^-3). Calculate the value of the equilibrium constant.

So if k=[NH3][HCl]/[NH4Cl]

I dont know what numbers to put in the brackets for mulitiplication and division. Where do I get those numbers, the book just shows values there on other problems for example it shows a problem of NO2/N2O4 where k=7.2x10^-3 but it does not say how it gets that number?

Solution Preview

Hello and thank you for posting your question to Branmass.

The guideline in equilibrium calculations is:
Only gases and solutions can have a concentration when it comes to reactions.
So we take into account only the ...

Solution Summary

This solution includes step-by-step calculations and explanations for calculating the value of an equilibrium constant for a chemical reaction.