Enthalpy Of Reaction And Calorimetry Worksheet Page 6
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20Hess’ Law – Using Enthalpies of Formation and the Summation Formula worksheet
For the following equations, create the equations of formation and use the ∆H f ° values to calculate the
∆H rxn °. Also for each question, use the Summation Formula (the one with ∑ in it) to calculate the ∆H rxn °.
1. Calcium carbonate decomposes at high temperature to form carbon dioxide and calcium oxide,
calculate the enthalpy of reaction.
2. Carbon tetrachloride can be formed by reacting chlorine with methane, calculate the enthalpy of
reaction.
CH 4
+
2 Cl 2
CCl 4
+
2 H 2
3. When potassium chloride reacts with oxygen under the right conditions, potassium chlorate is
formed:
2 KCl
+
3 O 2
2KClO 3
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