Calcium sulfate, , is a white, crystalline powder. Gypsum is a mineral, or natural substance, that is a hydrate of calcium sulfate. A 1.000-g sample of gypsum contains 0.791 g . How many moles of are there in this sample? Assuming that the rest of the sample is water, how many moles of are there in the
sample? Show that the result is consistent with the formula .

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Domarth DuqueLv10

22 Nov 2020

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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.

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

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