Number of phases in the following reaction

 

Question

CaCO3(s) ---->CaO(s) + CO2(g) ; in this hetreogenous reaction how many phases are there?

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solution:

Formula:

P = C - F + 2 

where 

P is number of phases, 

C is the number of components (roughly described as the minimum number of chemical species that are necessary to create all of the species in the system), 

 F is the number of degrees of freedom.

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Solution: 

given equation is a solid = solid + gas equilibrium, 

F= 1 because

the system is closed, and either pressure (p) or temperature (T) is fixed, then the other p-T variable will also be fixed at equilibrium so F = 1. 

Number of components is 2 (CaO and CO2) if we assume the conditions are such that no other substances such as CO are being formed. 

So if you substitute those numbers into the equation you’ll get P = 3.