The heat flows between the two by the cup. The cup gives the coffee heat to the person and vise versa.
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Answer: Its option "A" Both A and R are true and R is the correct explanation of A.
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I think the correct answer would be C. The expression that would best represent a second order rate law would be r =k[X][Y]. Reaction with this rate law are those that depend on the concentration of two first order reactants or a second order reactant.