I'm sorry. But I'm really in need of help right now. I have a final coming up in Chemistry in a few weeks. But there's just this concept that I didn't get. I couldn't understand the problem or how to solve it. More like, I can do half of the problem but would get stuck on the last half.

If anyone can help me, that'd be great. You'd save my grade. It'd be really awesome of you.

Currently, we've learned the Law of Conservation of Mass System and Law of Definite Proportions.

Now we'll use these two laws to answer problems.

It gives us two compounds with each element in grams. The question is to write the chemical formula for the compounds given.

Here is one of the problems:

Compound A: 35.9 g Cl / 64.1 g Cu

Compound B: 52.8 g Cl / 47.2 g Cu

a. Find (mass Cl / mass Cu) for each compound.

Compound A: 35.9/64.1 = .560/1

Compound B: 52.8/47/2 = 1.12/1

b. Compare the compound B and A for Cu and Cl

(Ignore the spaces between the chemicals below.)

Cu B/Cu A = 1/1   Same

Cl B/Cl A = 1.12/.560   B is twice of A

c. Find the simplest chemical formula.

Here is where I'm stuck on. I don't get it.

I think that the formula is CuCl₂  or CuCl?

I just don't know what to do.

Please. I've been stuck on this for days.

Anyone? Help me?