Complete combustion of an organic compound containing C, H, and O produces 0.66 g of CO₂ and 0.36 g of H₂O. If the original mass was 0.30 g, what is the mass of Oxygen in the sample?

0.10 g
0.08 g
0.22 g
0.15 g

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Mass of C = 0.66 * (12/44) = 0.18 g. Mass of H = 0.36 * (2/18) = 0.04 g. Total mass of C + H = 0.18 + 0.04 = 0.22 g. Mass of Oxygen = 0.30 - 0.22 = 0.08 g.

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