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The purity of a sample can be calculated using the following formula: Purity = (Weight of pure substance / Total weight of sample) x 100% where: - Weight of pure substance is the mass of the pure substance in the sample. - Total weight of the sample is the mass of the entire sample. For example, if you have a sample that weighs 100 grams and contains 90 grams of pure substance, the purity of the sample would be: Purity = (90 grams / 100 grams) x 100% = 90%