Transcript PERCENT COMPOSITION

PERCENT COMPOSITION
• The percent composition can be calculated from experimental
data. (there are other ways – we just won’t discuss yet)
% X = (total mass of X / total mass of compound)
A student prepares a compound of tungsten chloride
from 3.946 g of tungsten and 3.806 g of chlorine.
Assuming the reaction goes to completion, calculate the
percent composition.
 According to the Law of Conservation of Mass, 3.946 g
of W combines with 3.806 g of Cl to give 7.752 g of
compound.
 %W = (mass W / mass WxCly )100 = (3.946 g / 7.752 g)100
= 50.9%
 %Cl = (Cl / WxCly )100 = (3.806g / 7.752 g)100 = 49.1%