Composition and Mass

Questions (2)

15. On October 21, 1982, the Bureau ifthe Mint changed the composition of pennies. Instead of an alloy of 95% Cu and 5% Zn by
1. 1 answer
2. asked by kelly
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Caffeine is 49.47% carbon, 5.19% H, 28.8%Nand 16.48% O. What is mass of carbon in 37.1g of caffeine?
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2. asked by Connie
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