In combustion analysis, the carbon and hydrogen contents of a substance are determined from the CO₂ and H₂O, respectively, which are collected in the absorbers.

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This statement is true. Combustion analysis involves burning a substance in the presence of excess oxygen and collecting the resulting carbon dioxide and water vapor in absorbers. The amount of carbon and hydrogen in the substance can then be determined from the quantities of these gases collected.

In Combustion Analysis, the Carbon and Hydrogen Contents of a Substance