How does the Hreaction relate to the Hf of molecules involved in a reaction?A.Hreaction = Hf, reactantsB.Hreaction = Hf, productsC.Hreaction = Hf, products + Hf, reactantsD.Hreaction = Hf, products - Hf, reactants
Question
How does the Hreaction relate to the Hf of molecules involved in a reaction?A.Hreaction = Hf, reactantsB.Hreaction = Hf, productsC.Hreaction = Hf, products + Hf, reactantsD.Hreaction = Hf, products - Hf, reactants
Solution
The correct answer is D. Hreaction = Hf, products - Hf, reactants. This is based on Hess's Law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for each step in the reaction and is independent of the path of the reaction. In other words, the enthalpy change of a reaction (Hreaction) is equal to the sum of the enthalpies of formation (Hf) of the products minus the sum of the enthalpies of formation of the reactants.
Similar Questions
How is the Hf related to the H of a reaction?A.The Hreaction is the same thing as the Hf, reactants.B.The Hreaction is the sum of the Hf, products and the Hf, reactants.C.The Hreaction is the same thing as the Hf, products.D.The Hreaction is the difference between Hf, products and Hf, reactants.SUBMITarrow_backPREVIOUS
What does the H of a reaction represent?A.It represents the randomness of the products.B.It represents the usable energy in a reaction.C.It represents the thermal energy in a system.D.It represents the heat involved in a reaction.SUBMITarrow_backPREVIOUS
Which of the following describes an exothermic reaction?A.Hf, reactants = 0B.Hf, reactants = Hf, productsC.Hf, reactants > Hf, productsD.Hf, reactants < Hf, products
Derive the relationship between ∆ Ur and∆ Hr for reactions involving gaseousreactants and/or products
Define the following terms: a. Chemical reactions: b. Law of conservation of mass: c. Reactants: d. Products: e. Thermal decomposition: f. Coefficients: g. Subscripts: h. First Law of Thermodynamics: i. Heat: j. Specific Heat: k. Heat of Fusion: l. Heat of Vaporization:
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.