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1 July, 02:02

Use the accepted values for the molar masses of zinc and gold to determine the mass of gold needed to have the same number of atoms as 10 g of zinc.

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  1. 1 July, 05:56
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    30 g of Au have the same number of atoms as 10 g of Zn

    Explanation:

    Molar mass Au: 196.97 g/m

    Molar mass Zn: 65.41 g/m

    10 g of Zn are (mass / molar mass) = 0.153 moles

    (10 g / 65.41 g/m)

    And now let's count the atoms in this amount of Zn (mol. NA)

    0.153 m. 6.02*10²³ = 9.20*10²² atoms of Zn

    In which mass of Au, will we have, these quantity of atoms.

    So 9.20*10²² atoms are contained in 0.153 moles.

    Then, let's convert the moles in mass (mol. molar mass) to get the answer.

    0.153 m. 196.97 g/m = 30.1 g
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