Using Hess’s Law, the enthalpy of any reaction can be determined as long as… Group of answer choicesno energy is lost in the reactionthe reaction has been performed in a calorimeterthe enthalpies are added for any set of reactions that add to give the reaction of interestthe reaction does not involve any change in color

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.

Using Hess’s Law, determine the enthalpy of reaction for,C2H4(g)   +  H2(g)   –>  C2H6(g)     ΔH = ?Using the following reactions:C2H4(g)   +   3O2(g)   –>  2CO2(g)   +  2H2O(l)  ΔH = -1401 kJC2H6(g)  +  7/2O2(g)   –>   2CO2(g)   +  3H2O(l)  ΔH = -1550 kJH2(g)  +    1/2O2(g)  –>  H2O(l)    ΔH = -286 kJGroup of answer choices243 kJ-311 kJ95 kJ-137 kJ

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

Hess’s Law works because enthalpy is a…Group of answer choicesinverse functionstatic functionopen functionstate function