1. Compound Stoichiometry
formula % composition
% composition formula

2. % copper in malachite: Cu2CO3(OH)2
Percent Composition
% copper in malachite: Cu2CO3(OH)2

3. % copper in malachite: Cu2CO3(OH)2
Percent Composition
% copper in malachite: Cu2CO3(OH)2

4. Using Percent Composition
A compound contains:
43.6% P
56.4% S

5. Determining Empirical Formulas
A compound is found to contain
C, H, and O with composition:
C:     68.11%
H:     13.75%
O:     18.14%
What is the empirical
formula of this
compound?

7. Determining Empirical Formulas
A compound is found to contain C, H, and O with composition:
C:     68.11%
H:     13.75%
O:     18.14%
Where do these come from?
Galbraith Labs

8. Determining Empirical Formulas
A compound is found to contain C, H, and O with composition:
C:     68.11%
H:     13.75%
O:     18.14%
The way this really works.

9. Determining Empirical Formulas
The way this really works.
ic302222q

11. Solving Hard Problems g of a compound containing Fe and P is reacted so that the P is converted to phosphate ion, PO43-. It is then precipitated by forming an ionic compound with Ca2+ ions. The mass of the calcium phosphate has a mass of 6.16 g. What is the empirical formula of the original compound?

12. Solving Hard Problems g of a compound containing Fe and P is reacted so that the P is converted to phosphate ion, PO43-. It is then precipitated by forming an ionic compound with Ca2+ ions. The mass of the calcium phosphate has a mass of 6.16 g. What is the empirical formula of the original compound?

13. Empirical vs. Molecular Formulas
Build CF3CF3
Determine % composition of C and F:
Use % composition to determine formula:

14. Empirical vs. Molecular Formulas

15. Determining Molecular Formulas
A compound is:
P: 15.12%
N: 6.841%
Br: 78.04%
Molar mass = g/mol
What is the molecular formula?
Part 1. Determine empirical
formula to be PNBr2.

16. Hydrated Compounds

17. Hydrated Compounds A compound is: CoCl2  x H2O
Mass before heating: g
Mass after heating: g
What is x?

18. Hydrated Compounds A compound is: CoCl2  x H2O
Mass before heating: g
Mass after heating: g
What is x?