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

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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 = 0.129 J/(goC). Is the jewelry pure gold?

2. From the following enthalpies of reaction, 4 HCl(g) + O2(g)  2 H2O (l) + 2 Cl2(g) DH = -202.4 kJ/mol ½ H2(g) + ½ F2(g)  HF(l) DH = -600.0 kJ/mol H2(g) + ½ O2(g)  H2O(l) DH = -285.8 kJ/mol Calculate DHorxn for 2 HCl(g) + F2(g)  2 HF(l) + Cl2(g)