The ratio of amount of product obtained to amount of product expected by calculation, expressed as a percent.
Ex.
Percent Purity
Percent purity is the ratio of the mass of pure substance to mass of impure sample.
Percent Purity = mass of pure substance/mass of impure sample x 100%
Before we calculate how much product will form, we need to use percent purity to calculate how much reactant that actually is available to react.
Ex . If a 1.00g sample of Iron ore (the rock that the metal is found in) contains 0.60g of Iron metal, what's percent purity?
% purity = 0.60g Fe/1.00g Fe ore x 100% = 60 %
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