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Percent by Mass Composition

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Bronze is an alloy (a mixture of metals) of copper (Cu) and tin (Sn). A sample of brinze is analysed and found to contain 8.0% tin by mass. Therefore, in this sample, the ratio of copper atoms:tin atoms (Cu/Sn) is?

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In these types of quesitons, it is best to take 100 grams of your compound..... in this case ...

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The solution discusses the percent by mass composition.