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

How is Hess's law used to measure enthalpy of a desired reaction?A.Intermediate equations with known enthalpies are added together.B.The enthalpy from the final equation in a series of reactions is used.C.The enthalpy is determined from the enthalpy of similar reactions.D.The enthalpy is obtained from the enthalpy of an intermediate step.

What does Hess's law state about the total enthalpy change for a reaction?A.It depends on the reaction pathway.B.It is independent of the reaction pathway.C.It must be determined experimentally.D.It can only be calculated from the equilibrium constant.SUBMITarrow_backPREVIOUS

How is Hess's law used to calculate the enthalpy of a reaction?A.The desired enthalpy is obtained through adding intermediate reactions together.B.The enthalpy is obtained from the difference in final and initial reactions in a path.C.The final equation in a reaction path provides the enthalpy for the desired reaction.D.Enthalpies from similar equations are substituted for unknown reaction enthalpies.SUBMITarrow_backPREVIOUS

What is Hess's law?A.Hess's law states that the enthalpy of a reaction does not depend on the reaction path.B.Hess's law states that the enthalpy of a reaction changes with temperature.C.Hess's law states that the enthalpy of a reaction depends on the reaction path.D.Hess's law states that only changes in enthalpy of a reaction can be known.

state and explain hess's law