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20 March, 16:52

A compound is found to contain 6.1% hydrogen and 93.9% oxygen. Find it's empirical formula.

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  1. 20 March, 17:13
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    CH.

    Explanation:

    If the mass of the sample is 1.0 g, this means that it contains 6.1 g hydrogen and 93.9 g oxygen. We can obtain the no. of moles by dividing by its atomic masses.

    The no. of moles of hydrogen = mass / atomic mass = (6.10 g) / (1.00 g/mol) = 6.10 mol.

    The no. of moles of oxygen = mass / atomic mass = (93.90 g) / (16.00 g/mol) = 5.86 mol.

    We can obtain the empirical formula of the compound by dividing both no. of moles by the lowest no. of moles (5.86)

    ∴ The ratio of H:O is (1.04: 1.00) which is mainly 1.0: 1.0.

    So, the empirical formula of the compound is CH.
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