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21 August, 13:50

Methane is a compound which is 75% carbon, by mass, the balance being hydrogen. If a sample of methane weighs 24 g, what mass of hydrogen does it contain?

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  1. 21 August, 16:19
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    The mass of hydrogen is 6 grams

    calculation

    step 1: find the % of hydrogen

    = total % (100) - % of carbon (75%)

    = 100 - 75 = 25%

    step2: find the mass of hydrogen from its %

    that is 25/100 of 24 grams = 6 grams
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