Journal Entry:

The equation for the combustion of ethanol, C₂H₅OH (l), and selected standard heats of formation (ᐃH^०_F) are shown above. The standard heat of formation of CO₂ (g) is closest to:

(A)  -1,080 kJ mol^-1

(B)  -540 kJ mol^-1

(C) -510 kJ mol^-1

Learning Intentions

●     We will learn how  to calculate enthalpy of a reaction from a variety of given data. 

Closing Task:

You can calculate enthalpy of reaction using bond enthalpies in addition to heat of formation, Hess's Law, and q=mCΔT.

Content Standards being covered:

Chemical system undergo three main processes that change their energy: heating/cooling, phase transitions, and chemical reactions. (E.K. 5.B.3.)

At the particulate scale, chemical processes can be distinguished from physical processes because chemical bonds can be distinguished from intermolecular interactions. (E.K. 5.D.2)

 The net energy change during a reaction is the sum of the energy required to break bonds in the reactant molecules and the energy release in forming the bonds of the product molecules. The net change in energy may be positive for endothermic reactions where energy is required, or negative for exothermic reactions where energy is released. (E.K. 5.C.2)