Thermodynamics - Number Of Component [closed]








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> 
> $\ce{CaCO3(s) -> CaO(s) + CO2(aq)}$
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> 


It is said that the number of constituents for this reaction is three . 
I think number of constituents refer to the number of different elements in the system . As there are 3 different species so it is three.  

But for the number of components it is said that as $\ce{CaCO3 and CaO are both in solid state they form only one component}$ and the other component is $\ce{CO2 which is in aqueous form}$
So there are 2 components . 
I couldn't completely understand what is number of component ?
And is the above definition of number of constituents is correct ? 


