% composition

The student will

calculate % composition of each element in a compound.

calculate % composition of water in a hydrate.

calculate weight of metal extracted if given a specific sample amount.

% Composition p.227 chapter 7

Suppose the compound KClO3 is to be used as a source of oxygen. It would be helpful to know the % of O2.

% composition = mass of element

total mass of compoundWs 7.3

l. Potassium Chlorate

2. Ammonium Fluoride

3. Magnesium Chloride

X 100%

4. Lithium Bromate

5. Sulfuric acid

6. Calcium Phosphate

7. Nitric Acid

8. Barium Hydroxide

• What is the percent of water in

CuSO4 5H2O

Do problems 10,11

10.What is the percent water in

NiSO4 7H20?

11. What is the percent water in

Fe2(SO4)3 3H2O

12. Analysis of a compound has the results of being 32.85 grams of Silver and 8.98 grams of Sulfur. What is the percentage composition of this compound?

12A. If you had a 52 gram sample of the above compound, how much silver could you extract from the sample?

13.A sample of baking soda is analyzed and shows the following lab results: 22.99g of sodium, 1.01 g of hydrogen, 12.01 g of carbon, 48.00g of oxygen.

What percentage of each element is present?

14. Cholesterol is a compound that clogs blood veins. A sample of cholesterol was decomposed to the following weights. Carbon=20.96725g , H=2.99825g, O=1.0345g, Calculate the percent of each element.

15. Freon-12 is the liquid/gas used as a refrigerant in coolers. The gram weight of each element is as follows: Carbon=12.01g, Chlorine= 70.90g, Fluorine=38.00g

Calculate percent of each element.

AP- problem

Penicillin, the first of a now large number of antibiotics ,was discovered accidentally by the Scottish bacteriologist Alexander Fleming in 1928, but he was never able to isolate it as a pure compound. This and similar antibiotics have saved millions of lives that might have been lost to infections. Penicillin F has the formula C14H20N2SO4. Compute the mass percent of each element.

%C=53.81%

%H=6.453%

%N=8.969%

%S=10.27%

%O=20.49%

% composition

The student will

calculate % composition of each element in a compound.

calculate % composition of water in a hydrate.

calculate weight of metal extracted if given a specific sample amount.