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**1. A 5. 1 g piece of gold jewelry at a temperature of 100**

1. A 5.1 g piece of gold jewelry at a temperature of 100.0oC is placed in a coffee cup calorimeter containing 16.9 g of water at 22.5oC. The equilibrium temperature of the system is 23.2oC. The calorimeter constant is known to be 1.54 J/oC. What is the specific heat of the gold? For pure gold s = J/(goC). Is the jewelry pure gold?

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**2. From the following enthalpies of reaction,**

4 HCl(g) + O2(g) 2 H2O (l) + 2 Cl2(g) DH = kJ/mol ½ H2(g) + ½ F2(g) HF(l) DH = kJ/mol H2(g) + ½ O2(g) H2O(l) DH = kJ/mol Calculate DHorxn for 2 HCl(g) + F2(g) 2 HF(l) + Cl2(g)

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