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Chemistry · L3 · Finding Oxygen by Difference in Combustion Analysis

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What to do once the masses of C and H are known but don't add up to the total sample mass: the shortfall must be oxygen, since combustion analysis can't measure it directly.

by @openstemUpdated Chemistry
Total originalsample massDoes mass of C+ mass of H equalthe total sample mass?No oxygen present:pure hydrocarbonMissing mass = mass of Om(O) = m(sample) - m(C) - m(H)O can't be trapped and weigheddirectly - both CO2 and H2O trapsalso contain O from the excess O2 gasConvert m(O) to molesand include it in the ratio stepyesno - some mass is unaccounted for

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