Question

1. A confiscated white substance, suspected of being methamphetamine, was purified by a forensic chemist and subected to elemental analysis. Combustion of a 50.86 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 molecular formula of methamphetamine is C10H15N.

a. Determine the empirical formula for the unknown white substance.

b. Can the forensic chemist conclude that the suspected compound is methamphetamine? Explain.

2. The mineral gypsum is a hydrate, with the formula CaSO4∙2H2O. A sample of gypsum was heated until all the waters of hydration were driven off and the anhydrous calcium sulfate was obtained. After heating, the mass of calcium sulfate was 2.655 g. What was the mass of the original gypsum sample

Answer 1

answered by: anonymous