1. How many mLs of 0.560M NiCl2 (FW=129.606) solution are required to react with 15.00 mL of 0.808M AgC2H3O2 (FW=166.912) solution?
2AgC2H3O2 (aq) + NiCl2(aq) → 2AgCl(s) + Ni(C2H3O2)2 (aq)
2. A mixture of He and O2 is placed in a 4.00 L flask at 32 °C. The partial pressure of the He is 2.7 atm and the partial pressure of the O2 is 1.4 atm. What is the mole fraction of O2?