Stoichiometry - Energy and Percent Yield

Enthalpy is the energy stored in chemical bonds. The Symbol of Enthalpy is H and the units is in Joules (J). In exothermic reactions, enthalpy decreases. In endothermic, the enthalpy increases.


CALORIMETRY
To experimentally determine the heat released we need to know 3 things.

1. Temperature Change (ΔH)
2. Mass (m)
3. Specific Heat capacity (c)

These 3 are related by the equation

• ΔH = mCΔT
• ΔH = mC(Tf-Ti)