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March 26, 2017

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Before 1982 the US Mint cast penny coins from a copper and zinc mixture. If a 1980 penny weighs 3.051g and contains 0.153g zinc, what is the percent of copper in the coins?

  • chemistry - ,

    3.051 g = mass Cu + Zn
    -0.153 g = mass Zn from the problem.
    ---------------
    2.898 g Cu
    %Cu = (2.898/3.051)*100 = ??

  • chemistry - ,

    94.99%

  • chemistry - ,

    gfh

  • chemistry - ,

    3.051 g Cu and Zn -0.153 g Zn=2.898 g Cu
    After that: 2.898 g Cu/3.051 g Cu+Zn=0.94985 x 100%=94.99%

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