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5 February, 15:07

If 3.50 g of the unknown compound contained 0.117 mol of C and 0.233 mol of H, how many moles of oxygen, O, were in the sample? Express your answer to three significant figures and include the appropriate units.

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  1. 5 February, 15:34
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    0.116 g.

    Explanation:

    Firstly, we can find the mass of C and H in the unknown compound:

    mass of C = (no. of moles of C) (atomic mass of C) = (0.117 mol) (12.01 g/mol) = 1.405 g.

    mass of H = (no. of moles of H) (atomic mass of H) = (0.233 mol) (1.01 g/mol) = 0.235 g.

    ∴ mass of O = mass of unknown sample - (mass of C + mass of H) = 3.50 g - (1.405 g + 0.235) = 1.86 g.

    ∴ no. of moles of O = (mass of O) / (atomic mass of O) = (1.86 g) / (16.0 g/mol) = 0.116 g.
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