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Ch.6 - Thermochemistry WorksheetSee all chapters

# Formation Equations

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Sections
Nature of Energy
Kinetic & Potential Energy
First Law of Thermodynamics
Internal Energy
Endothermic & Exothermic Reactions
Heat Capacity
Constant-Pressure Calorimetry
Constant-Volume Calorimetry
Thermal Equilibrium
Thermochemical Equations
Formation Equations
Enthalpy of Formation
Hess's Law
Enthalpy (IGNORE)

Formation Equations involve the standard states of elements combining to form 1 mole of product.

###### Standard States & Formation Equations

Concept #1: The Natural State (Standard State)

Elements can exist as solids, liquids or gases at 25ºC and 1 atm standard pressure.

Example #1: Which of the following elements is found in its standard state?

Example #2: Write the formation equation for methanethiol, CH3SH.

Practice: Which of the following represents the formation equation for barium nitrate, Ba(NO3)2?

Practice: Identify a substance that is not in its standard state.

Practice: Ibuprofen is used as an anti-inflammatory agent used to deal with pain and bring down fevers. If it has a molecular formula of C1318O2, determine the balanced chemical equation that would give you directly the enthalpy of formation for ibuprofen.