CHAPTER 3,MOLE CONCEPT

Questions

1.Define empirical formula.

2.Write the equation of concentration of a solution.

http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Stoichiometry_and_Balancing_Reactions

http://www.bbc.co.uk/bitesize/higher/chemistry/calculations_1/mole/revision/1/

http://www.chemteam.info/Stoichiometry/Stoichiometry.html

Worksheet

1.Find the empirical formula of the following compounds

a)Na =32.40%        O=45.07%       S=22.3%

b) Ag=63.53%         N=8.23%         O=28.24%

c) Ca=71.43%          O=28.57%

2.Calculate the number of moles ;

a)400g of NaOH

3)Calculate the following;

a)percentage of phophorous in H3PO4

b)percentage of magnese in KMnO4

4)Calculate the following;

a) mass of 192 moles of HCl

b)moles in 510g of Al2O3