Copper has two isotopes, copper-63 and copper-65. It has an atomic mass of 63.546 amu. Determine the percentage of copper-63 isotope present. Hint: Let x represent the amount of copper-63 and let 1-x represent the amount of copper-65. Round your final answer to the nearest percent.

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

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.