# Chemistry

Brass is an alloy that is approximately 67% Cu and 33% Zn, by mass. How many grams of Cu and Zn are in a brass doorknocker weighing 2.2 pounds?

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1. lb Zn = 2.2 x 0.33 = ??lb Zn. Convert that to grams.
lb Cu = 2.2 x 0.67 = ??lb Cu. Convert that to grams.

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