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  • Home / Ask Me Stuff
  • Free Lessons
    • Thermodynamics >
      • Thermochemistry Worksheet + Answers
      • First Law of Thermodynamics
      • Pressure-Volume Work
      • Enthalpy
      • Hess' Law
      • Enthalpy of Formation
      • Heat Capacity
      • Calorimetry
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      • Spontaneity: Gibbs Free Energy
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      • Redox Reactions
      • Introduction to Half-Reactions
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      • How to Balance Redox Reactions (Basic Solution)
      • Galvanic Cells
      • Standard Reduction Potentials
      • Electrolytic Cells
      • Nernst Equation
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      • Introduction
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      • Rate Laws
      • Zero-Order Reactions
      • First-Order Reactions
      • Second-Order Reactions
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      • Arrhenius Equation
      • How Long will it Take to Decay?
      • What Order is this Reaction?
      • Find the Rate Constant
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      • Pressure, Volume, Temperature
      • Ideal Gas Law
      • Density of Gases
      • Ideal Gas Law and Changes in P, V, T
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      • Phase Changes
      • Intermolecular Forces
      • Effects of Intermolecular Forces
      • Ranking by Boiling/Melting Point
      • Clausius-Clapeyron Equation
      • Heating Curves
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      • Ionic/Metallic/Covalent
      • Symmetry of Solids
      • Simple Cubic, fcc and bcc
      • How to Find Edge Length
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      • Br2 + Alkene (Adding across a double bond)
      • HCl + Alkene (Adding across a double bond)
      • Reaction of OH with Alkyl Halide
      • What is Regioselectivity?
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      • Average Atomic Mass
      • Solve for Isotopic Abundance
      • Limiting Reagents
      • Percent Yield
      • Actual Yield and Percentage Yield
      • Percent Composition
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      • What's in an Atom?
      • Quantum Numbers
      • Pauli, Aufbau, Hund
      • Light: E h ν λ
      • Energy Levels of Hydrogen
      • Energy Levels of Non-Hydrogen Atoms
    • Organic Naming >
      • Naming Organic Molecules
      • How to Name Amines
      • How to Name Amides
    • Lewis Structures
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Spontaneity at Different Temperatures


Most commonly, we are given standard free energy (ΔGº) for a reaction, which is at 1 atm and 25ºC (and 1 M if it's a solution). But theoretically, we can drive ANY reaction forward if we supply it with enough energy (heat) ... as long as we overcome the activation energy barrier.

To calculate the free energy change of a reaction at any temperature, we use the formula:
Picture
where Q is the reaction quotient. It is created the exact same way as the equilibrium constant, K, except the current concentrations are used instead of the equilibrium concentrations.

It is also worth noting that we can calculate the equilibrium constant (K) from the standard free energy, and vice versa:
Picture
Created by Nathan Oldridge (aka ChemistNATE).  All lessons here are Public Domain.