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An imaginary reaction X rarr Y takes pla...

An imaginary reaction `X rarr Y` takes place in three steps
`X rarr A, DeltaH=-q_(1), " "BrarrA, DeltaH=-q_(2), " "BrarrY, DeltaH=-q_(3)`
If Hess's law is applicable, then the heat of the reaction `(X rarr Y)` is :

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