# Standard Enthalpy of Formation: Explanation & Calculations

Instructions:

question 1 of 3

### Standard conditions for enthalpies of formation are

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### 2. Delta H°f values: CH4(g), -74.8 kJ/mol; CO2(g), -393.5 kJ/mol; H2O(l), -285.8 kJ/mol. Using the delta H°f data above, calculate delta H°rxn for the reaction below. Reaction: CH4(g) + 2O2(g) ==> CO2(g) + 2H2O(l)

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This quiz/worksheet combo will test your knowledge of the standard enthalpy of formation and its role in chemical reactions.

## Quiz & Worksheet Goals

Some topics you can test in these assessments are:

• The standard conditions for enthalpies of formation
• A meaning of enthalpy as it relates to state property
• Why elements have a delta Hf value of 0.00 kj/mol

## Skills Practiced

• Information recall - access the knowledge you've gained regarding the standard conditions for enthalpies of formation and understand the reasons for these conditions
• Knowledge application - use your knowledge to answer questions about a meaning of enthalpy as it relates to state property and comprehend what it defines
• Problem solving - use acquired knowledge to solve practice problems that ask you to calculate the enthalpy change of a reaction and how much heat a reaction gives off

Continue to explore information about the standard enthalpy of formation by reviewing the lesson called Standard Enthalpy of Formation: Explanation & Calculations. Some subjects this material covers includes:

• The energy involved in a chemical reaction
• What is the standard enthalpy of formation
• How to calculate enthalpy change of reaction
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