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Unformatted text preview: 2. A 50 mg sample of a dental cement, composed of a single chemical compound, contains 16.58 mg oxygen, 8.02 mg phosphorous, and 25.40 mg zinc. The formula weight of this compound is between 250 and 400 g/mol. Determine the formula of this compound. 3. A metal M forms an oxide named X. X has empirical formula MO 2 , and is 13.38 mass per cent oxygen. When heated, X gives off oxygen and converts to Y, which is 9.334 mass per cent oxygen. (a) What is the identity of metal M? (b) What is the empirical formula of compound Y? 4. A widely prescribed allergy medication is entirely composed of C, H, Cl, N, and O, and is 54.62 mass % C, 5.89 mass % H, 23.02 mass % Cl, and 6.07 mass % N. Its molar mass is less than 600 g/mol. How many molecules of this medication are contained in a standard dose of 10.0 mg?...
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