What does these symbols represent? (Thermodynamics). Please define als

1.	What does these symbols represent? (Thermodynamics). Please define also.1). ∆H° 2). ∆fH° 3). ∆rH
Answer» ∆rH for a reaction is defined as the difference between ∆fH value of products and ∆fH value of reactants.∆H is negative for exothermic reactions which evolve heat during the reaction and∆H is positive for endothermic reactions which absorb heat from the surroundings.

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