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rate constant
in the equation rate=k[A] for equation A+B=products, do you include a reactant if it is a solid
aash18
in the equation rate=k[A] for equation A+B=products, do you include a reactant if it is a solid
Yes. The reactants can be in any phase. All the rate equation shows is the time taken for a reaction to occur between reactants A and B (regardless of state).
No, you can't calculate the concentration of a solid. There are other ways of modelling the rate of a reaction at a solids surface (this is beyond A-level) 
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