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14 February, 00:21

How many grams of ZnO would you need to produce 50 g of ZnCl2? (The atomic mass of Zn is 65.38 and of Cl is 35.45.)

ZnO (s) + 2HCl (aq) → ZnCl2 (s) + H2O (l)

17.1 g

29.8 g

59.7 g

83.8 g

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  1. 14 February, 02:25
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    ZnO (s) + 2HCl (aq) → ZnCl2 (s) + H2O (l)

    Look at the moles:

    1 + 2 → 1 + 1

    How much ZnO do we need to make 50g of ZnCl2? Notice it is these numbers in () and should be 1:1

    (1) + 2 → (1) + 1

    So we need the same number of moles, but how many moles is 50g of ZnCl2? Zn weight is 65.38g, and Cl is 35.45g. So ZnCl2 is (65.38) + (2 X 35.45) = 136.28g

    50g/136.28g = 0.3669 moles

    What is 0.3669 moles of ZnO now?

    O weighs 16g/mol, so add 65.38 + 16 = 81.38

    Multiply by 0.3669 moles and get how many grams we need.
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