What does Hess's law state? A. The enthalpy of a reaction is positive if it is endothermic and negative if exothermic. B. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions. C. The enthalpy of a reaction can be determined only from single- step reactions. D. The enthalpy of a reaction can be measured from heat produced in a calorimeter.
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What does Hess's law state? A. The enthalpy of a reaction is positive if it is endothermic and negat...
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