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    sara_gray106's Avatar
    sara_gray106 Posts: 1, Reputation: 1
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    #1

    Apr 13, 2014, 01:08 PM
    Chemistry
    What mass of zinc sulphide is formed when 1.75 grams of zinc reacts? Is the answer 2.53 mol of ZnS?
    CWH68's Avatar
    CWH68 Posts: 26, Reputation: 2
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    #2

    Apr 17, 2014, 07:41 PM
    1.75 g Zn x (1 mole Zn/65.38 g Zn) x (1 mole Zn/ 1 mole ZnS) =

    0.02677 moles ZnS will be produced, which is

    0.02677 moles ZnS x (97.44 g ZnS/ 1 mole ZnS) =

    2.608 g ZnS will be produced.

    Here, the molecular weight of zinc is 65.38 g/mole. The molecular weight of sulfur is 32.06 g/mole, so the molecular weight of ZnS is
    65.38 g/mole + 32.06 g/mole = 97.44 g/mole.

    Thus the mass of zinc sulfide produced is 2.608 g.

    -CWH :)
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