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Understanding Heat of Reactions: Specific Heat, Heat of Vaporization, and Fusion

Learn about specific heat, the amount of energy needed to raise 1g of a substance by 1°C or K, and heat of vaporization and fusion, the energy required to vaporize or melt 1g of a substance. Discover how to calculate these values and understand their significance. Explore practical applications and examples.

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Understanding Heat of Reactions: Specific Heat, Heat of Vaporization, and Fusion

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  1. Heat of Reactions Objective 4.02

  2. Specific Heat • Amount of energy required to raise the temperature of 1g of a substance by 1 degree Celsius (or Kelvin). • Cp = J/(g∙K) or J/(g∙°C) q = mCpΔT q = energy lost or gained m = mass ΔT = change in temp Ex: pg 513

  3. Heat of Vaporization • The amount of heat required to vaporize 1g of liquid (water) at its boiling point. • Hv = (J/g) q = mHv

  4. Heat of Fusion • The amount of energy required to melt one g of a solid (water) at its melting point. • Hf = (J/g) q = mHf

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