Monday, April 4, 2011

Apr 04 2011 Percent Yield & Percent Purity

Percent Yield

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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