17.4: Calculating Heats of Reactions

“if you add two or more thermochemical equations to give a final equation, then you can also add the heats of reaction to give the final heat of reaction”

• Hess’s law.

• Avogadro’s law

• Boyle’s law.

Hess's law allows you to determine the heat of reaction indirectly by using the known heats of reaction of two or more thermochemical equations.

• True

• False

The change in enthalpy that accompanies the formation of one mole of a compound from its elements with all substances in their standard states.

• The standard heat of formation.

• The standard heat of combustion.

• The standard heat of vaporization.

• -30.91kJ

• 30.9kJ

• 0.0 kJ

• -853.9 kJ

• 853.9 kJ

• 2498.1 kJ

• -1.9 kJ

• 1.9 kJ

• -788.9 kJ

• -110.5kJ

• 110.5 kJ

• -676.5 kJ