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7 August, 03:19

Determine the mass of oxygen in a 7.20 g sample of Al2 (SO4) 3.

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Answers (2)
  1. 7 August, 05:18
    0
    Given:

    7.20 g sample of Al2 (SO4) 3

    Required:

    Mass of oxygen

    Solution:

    Since you are not given a chemical reaction, just base your solution to the chemical formula given.

    Molar mass of Al2 (SO4) 3 = 342.15 g/mol

    7.20 g Al2 (SO4) 3 (1 mol/342.15g) (3mol O/2 mol Al) (1 mol O2/1/2 mol O2) (32g O2/1mol O2) = 4.04 g O2
  2. 7 August, 06:57
    0
    Molar mass of Al2 (SO4) 3 = 342.15 g/mol

    Molar Mass of O = 16g

    in Al2 (SO4) 3 the mass of O2 = 16 x 7 = 112g

    342.15 g : 112g

    7.20g : X

    X = 2.36 g of Oxygen
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