In chemical reactions, heat is converted into chemical energy (the potential ene

Question

In chemical reactions, heat is converted into chemical energy (the potential energy stored in chemical bonds) or vice versa. Bond energy is the energy required to break one mole of the bond in the gas phase. Since it takes energy to break a bond, bond energies are always positive. Conversely, energy is released when bonds are formed. Thus, the enthalpy change for a reaction can be approximated from Delta H_rxn = Sigma(Delta H breaking) + Sigma (Delta H forming) where H represents bond energies for the breaking (positive bond energy) or forming (negative bond energy) of a bond and H_rxn represents the overall enthalpy for the reaction. Use the table to answer questions about bond energies. Calculate the bond energy per mole for breaking all the bonds in methane, CH_4. Express your answer to four significant figures and include the appropriate units. Calculate the bond energy per mole for breaking all the bonds of oxygen, O_2 ? Express your answer to three significant figures and include the appropriate units. Calculate the bond energy per mole for forming all the bonds of water molecules, H_2 O. Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

In chemical reactions, heat is converted into chemical energy (the potential ene

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.