1. 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?

5. 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)