An experiment is preformed to determin the empirical formula of a copper iodide formed by direct combination of elements. A clean strip of copper metal is weighed accurately. Its is suspended in a test tube containing iodine vapor generated by heating solid iodine. A white compound forms on the strip of copper, coating it uniformly. The strip with the adhering compound is weighed. Finally, the compound is washed completely from the surface of the metal and the clean strip is dried and reweighed.

Question

Data Table
Mass of clean copper strip 1.2789 grams
Mass of copper strip&compound 1.2874 g
Mass of copper strip after washing 1.2748 g

a. State how you would use the data above to determine each of the following.
1.The # of moles of iodine that reacted.
2. The number of moles of copper that reacted.

B) explain how you would determine the empirical formula for the copper iodine.

C) Explain how each of the following would affect the empirical formula that could be calculated.
1. some unreacted iodine condensed on the srip.
2. A small amount of the white compound flaked off before weighing.

PLEASE HELP!!!!

An experiment is preformed to determin the empirical formula of a copper iodide formed by direct combination of elements. A clean strip of copper metal is weighed accurately. Its is suspended in a test tube containing iodine vapor generated by heating solid iodine. A white compound forms on the strip of copper, coating it uniformly. The strip with the adhering compound is weighed. Finally, the compound is washed completely from the surface of the metal and the clean strip is dried and reweighed.

Some hints below.

Data Table
Mass of clean copper strip 1.2789 grams 1
Mass of copper strip&compound 1.2874 g2
Mass of copper strip after washing 1.2748 g 3

#2-#1= mass of iodine added.
#1-#3=mass of copper reacted.
Remember that #mol = grams/atomic mass.

a. State how you would use the data above to determine each of the following.
1.The # of moles of iodine that reacted.
2. The number of moles of copper that reacted.

B) explain how you would determine the empirical formula for the copper iodine.

C) Explain how each of the following would affect the empirical formula that could be calculated.
1. some unreacted iodine condensed on the srip.
2. A small amount of the white compound flaked off before weighing.

Post your work if you get stuck. The hints I gave at the beginning should allow you to complete the questions.

I really don't understand how to do C in this question. I got a and b but im stuck on c.

The easiest way to do this is to think about what happens to the weighings. For C1. if some unreacted iodine condensed on the strip, that would make the strip heavier than it should be so mass of strip and compound would increase (what I labeled as 2 in my first response) so the mass of 2 would be higher. How will that affect the mols of copper? How will that affect the mols of iodine? How will that affect the formula?
For C2. Same idea but if some of the white compound flaked off, then the #3 weighing would be too low. How will that affect mols copper, iodine, etc.