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# Thermochemistry Problems

See examples of worked chemistry problems pertaining to physical chemistry and thermochemistry.

Bond Energies & Enthalpies
This is a step-by-step worked problem to help you calculate bond energies and enthalpies for gaseous reactions.

Bond Energies and Enthalpy Change Example Chemistry Problem
Bond energies and enthalpy can be used to determine if a reaction is endothermic or exothermic. Here is an example showing how to determine the change in enthalpy of a reaction.

Calorimetry and Heat Flow
There's a worked example for coffee cup calorimetry and another for bomb calorimetry, with links to review calorimetry and thermochemistry concepts.

Enthalpy Change Example Problem
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.

Enthalpy Change Example Problem
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.

Enthalpy Change Example Problem
Worked Example Chemistry Problems - Determining change in enthalpy of melting ice and vaporizing water. Additional worked problem to determine mass of ice melted from given energy value.

Heats of Formation
These are examples of how to calculate the heats of formation for compounds and ions in aqueous solution. Links are given to rules of thermochemistry and explanations of endothermic and exothermic reactions.

Temperature Conversions
These are examples of temperature conversion problems, with links to other worked chemistry problems and homework help.

Temperature Unit Conversion Problem
This is a worked conversion problem showing how to convert from Kelvin to degrees Celsius and Fahrenheit.

Heat Capacity Example Problem
This example problem demonstrates how to calculate the amount of heat required to change the temperature of a substance.

Heat of Fusion Example Problem
This example problem demonstrates how to calculate the amount of heat required to change the phase of a substance from solid to liquid using the heat of fusion.

Heat of Vaporization Example Problem
This example problem demonstrates how to calculate the amount of heat required to change the phase of a substance from liquid to gas using the heat of vaporization.

Heat Capacity and Phase Change Example Problem
This worked example problem demonstrates how to calculate the energy required to raise the temperature of a sample that includes changes in phase. This problem finds the energy required to turn cold ice into hot steam.

Specific Heat Example Problem
This worked example problem demonstrates how to calculate the specific heat of a substance when given the amount of energy used to change the substance's temperature.

Heat Capacity Example Problem - Find Final Temperature
This worked example problem demonstrates how to calculate the final temperature of a substance when given the amount of energy used, the mass and initial temperature.