A piece of metal weighing 55 g was heated to 45.5 °C and then put it into36g of water (which had an initial temp of 22 °C). The metal and water were allowed to come to an equilibrium temperature, determined to be 25.5 °C. Assuming no heat
lost to the environment:
1. Identify all the variables in the chart
Variable
Metal
Water
m=
CA
T final=
Tinitial
Delta T=

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.