A confiscated white substance suspected of being cocaine, Chemistry

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A confiscated white substance suspected of being cocaine

A confiscated white substance suspected of being cocaine was purified by a forensic chemist and subjected to elemental analysis. Combustion of a 50.68 mg sample yielded 150.0 mg of CO2 and 46.05 mg of H2O. Analysis for nitrogen showed that the compound contained 9.39% N by mass. The formula for cocaine is C17H21NO4. Can the forensic scientist conclude that the suspected compound is cocaine?

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