# Ap chem

1. Sep 13, 2010

### priscilla98

1. The problem statement, all variables and given/known data
5.0 g of Zn is heated with an equal amount of S, bow much zinc sulfide is produced?

2. Relevant equations

3. The attempt at a solution

Wouldn't there be an equation to solve this problem? I know law of constant composition is an observation that the elemental composition of a pure compound is always the same.

2. Sep 13, 2010

### Bohrok

By equation do you mean a chemical equation?

You have 5.0 g of Zn and 5.0 g of S, you need to find out which is the limiting reagent.

3. Sep 13, 2010

### priscilla98

Okay, then do you have to do a balanced chemical equation?

4. Sep 13, 2010

### Bohrok

5. Sep 13, 2010

### priscilla98

5 Zn --> 5 S

Do you mean something like this? I really do appreciate this alot, thanks for your help

6. Sep 13, 2010

### Bohrok

Zn and S are the reactants, so they go on the left side.

Zn + S → ZnS
(now you know what the equation is)

The masses of the reactants don't have a part in the equation itself at all.

Last edited: Sep 13, 2010
7. Sep 13, 2010

### priscilla98

ok thanks a lot for this

8. Sep 13, 2010

### Bohrok

Do you know how to convert grams of a substance to moles? I would first start changing all the grams to moles.