Copper has two isotopes; 63Cu and 65Cu with the amount of 79.4% and 20.6%, respectively. Calculate the mass of 0.1 mol 63Cu if the average atomic mass of copper is 63.5 and atomic mass of 65Cu is 65.1 A. 3.5 g
B. 6.31 g
C. 15.3 g
D. 16.8 g
E. 20.2 g

Idid a lab for chemistry where we put nails in a copper (ii) chloride solution. 1. why did the reaction stop? which reactant was used up? how do you know? 2. describe what was happening to the atoms of iron and copper during the reaction. what is this type of reaction called? 3. what would happen to the ratio of copper to iron if you had placed more nails in the beaker? if you had let the reaction go for less time? 4. what is the accepted ratio of copper atoms to iron atoms in this reaction? account for differences between your experimental value and the accepted value. write the balanced equation for the reaction.