Example
What is the percent purity of a sample of gold if the total mass of the sample is 132g and the mass of pure gold in the sample is 84g?
Answer: (84g/132g) x 100% = 63.6% = 64%
Percent Impurity = (Mass of impure substance / Mass of total sample) x 100%
Example
What is the percent impurity of a sample of 210g silver if the mass of pure silver is 43g?
Answer: 210g-43g =167g of impure substance (167g/210g) x 100% = 79.5 = 80%