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4 January, 03:30

So, if a sample of a compound decomposed to its constituent elements and produced 25.6 g of o, and 9.60 g of carbon, and another sample produced 21.6 g of o, how much carbon was produced in the second sample?

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  1. 4 January, 03:41
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    Method 1:

    First find out the formula of the sample.

    no. of moles of O = 25.6/16 = 1.6

    no. of moles of C = 9.6/12 = 0.8

    ratio of C:O = 1:2

    formula is CO2

    In the second sample,

    no. of moles of O = 21.6/16 = 1.35

    no. of moles of C = 1.35/2 = 0.675

    mass of C = 0.675 x12 = 8.1g

    method 2:

    Actually it's quite simple. The two samples are the same compound so the elements produced should be in the same ratio.

    C/9.6 = 21.6/25.6

    C = 8.1g
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