2/14/11

Happy Valentine's Day!!

Today we went over the limiting reactants quiz and started percent composition.
The candy lab will be collected tomorrow, and there will be a quick homework quiz on % comp.

Answers to the first 2 questions:

1) Sodium bromide

NaBr
102.9 g/mol
Na: 23 g
Br: 79.9 g
% Na: (23/102.9)x100 = 22.4%
% Br: (79.9/102.9)x100 = 77.6%

2) Copper hydroxide

Cu(OH)2
97.5 g/mol
Cu: 63.5 g
O: 32 g
H: 2 g
Cu: 65.1%
O: 32.8%
H: 2.1%