Cracking the AP Chemistry Exam 2019, Premium Edition by Princeton Review

Author:Princeton Review
Language: eng
Format: epub
Publisher: Random House Children's Books
Published: 2018-11-05T16:00:00+00:00

So, 106 kJ of energy is released (indicated by the negative sign). Don’t forget to take mole ratios into account when doing thermodynamics problems that involve stoichiometry. As a general rule, whenever you are given specific amounts of reactants (either in grams or moles) and asked about the energy change for a reaction, you will have to use stoichiometry to get the correct answer.

BOND ENERGY

Bond energy is the energy required to break a bond. Because the breaking of a bond is an endothermic process, bond energy is always a positive number. When a bond is formed, energy equal to the bond energy is released.

∆H° = Σ Bond energies of bonds broken – Σ Bond energies of bonds formed

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