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Percentage of oxygen when 0.492 g of a C, H, O compound gives 0.793 g of CO2 and 0.442 g of water

The same question, asked 2 times: 28 Jun 2022*, 28 Jul 2022. Every wording below, oldest first.

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  1. Question 1

    28 Jun 2022

    148
    The complete combustion of 0.492 g0.492\text{ }g of an organic compound containing ' CC ', ' HH ' and ' OO ' gives 0.793 g0.793\text{ }g of CO2CO_{2} and 0.442 g0.442\text{ }g of H2OH_{2}O. The percentage of oxygen composition in the organic compound is . (nearest integer)

  2. Question 2

    28 Jul 2022

    60
    On complete combustion of 0.492 g0.492\text{ }g of an organic compound containing C,HC,H and O,0.7938 gO,0.7938\text{ }g of CO2CO_{2} and 0.4428 g0.4428\text{ }g of H2OH_{2}O was produced. The %\% composition of oxygen in the compound is