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17 April, 21:35

The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 2.50 g of butane?

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  1. 17 April, 22:02
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    The exact molecular mass for butane (C4H10) is

    12.0096*4+1.0079*10=58.1174 which is 58.1 to 3 significant figures.

    Proportion of carbon in the compound

    12.0096*4: 58.1174

    =>

    48.0384 : 58.1174

    The mass of carbon in 2.50 grams of butane can be obtained by proportion, namely

    Mass of carbon

    = 2.50 * (48.0384/58.1174)

    = 2.0664

    = 2.07 g (approximated to 3 significant figures)
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