Which of the following statements is true when using Hess's Law with standard enthalpies of formation to calculate the enthalpy change of a reaction? 

The standard enthalpy of formation for an element in its standard state is always positive.

The enthalpy change of a reaction calculated using standard enthalpies of formation is always negative.

The sum of the standard enthalpies of formation of the reactants equals the sum of the standard enthalpies of formation of the products.

The enthalpy change of a reaction can be calculated by subtracting the sum of the standard enthalpies of formation of the products from the reactants.

Chemistry

College Board

Exam No：AP Chemistry Problem Set 3 Year：2024 Question No：APChemistry2024AP0509

Answer:

Knowledge points:

6.9 Hess’s Law

Solution:

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Which of the following statements is true when using Hess's Law with standard enthalpies of formation to calculate the enthalpy change of a reaction?&nbsp;

Answer:

Knowledge points:

Solution:

Related Question

Which of the following statements is true when using Hess's Law with standard enthalpies of formation to calculate the enthalpy change of a reaction?