Equilibrium Constant for Calcium Carbonate Reaction at 500 C

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Homework Help Overview

The discussion revolves around the equilibrium constant for the reaction of calcium carbonate decomposing into calcium oxide and carbon dioxide at a temperature of 500°C. Participants are exploring the relationship between pressure and equilibrium constants in the context of this chemical reaction.

Discussion Character

  • Conceptual clarification, Assumption checking, Mixed

Approaches and Questions Raised

  • Participants are questioning how to correctly express the equilibrium constant, particularly in relation to the pressure of the gaseous product, CO2. There are attempts to clarify whether pressure can be used in place of concentration for gases in equilibrium expressions.

Discussion Status

The discussion is ongoing, with some participants providing insights into the relationship between pressure and molarity, while others express uncertainty about the correct approach to calculating the equilibrium constant. No consensus has been reached yet.

Contextual Notes

There is mention of varying temperatures affecting the equilibrium pressure of CO2, which may influence the calculations. Additionally, some participants indicate a lack of confidence in their chemistry knowledge, which may affect the depth of the discussion.

Hypercase
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Calcium Carbonate is heated in a closed vessel, and an equilibrium is reached.

CaCO3 (s) <=> CaO(s) + CO2 (g)
At 500 C the equilibrium pressure of carbon dioxide is 1.2*10^-3 atm and at 1000 C it is 3.87 atm.
what is the equilibrium constant for this reaction at 500 C? :confused:
 
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Try posting your questions in the chemistry subforum here at PF (I don't have the time to help you at the moment).
 
I'm not really good at chemistry but isn't it 1.2*10^-3? The only gas around is CO2 so writing the equlibrium formula gives CO2's pressure. This probably isn't right but how to do it?
 
The equilibrium formula refers to concentration not pressure of a liquid. Is it the same for a gas? or is the pressure used in the case of a gas?
 
I think I got it right now. Since PV=nRT, P=MRT. Thus, M=P/RT. I think you can do the rest.
 

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