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7 May, 21:28

What is the mass in kilograms of 1.20x 1028 atoms of copper, cu?

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  1. 7 May, 23:15
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    Mass of 1 atom of Cu=63.546 A. M. U

    =63.546*1.66*10^ (-27) kg

    = 105.48636*10^ (-27) kg

    So,

    Mass of 1.2*1038 atoms of Cu

    = 1.2*1028*105.48636*10^ (-27) kg

    = 130127.973696*10^ (-27) kg ANS!

    Note that: 1 A. M. U=1.66*10^ (-27) kg
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