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1 Reyes Molar Mass and Percentage Composition from Chemical Formulas Show your work for every calculation. Round your answer to the correct number of significant figures and record your final answer with correct units on the line provided. 1. Determine the molecular mass for the following compounds. a. laughing gas, nitrous oxide, N 2 O b. milk of magnesia, Mg(OH) 2 c. odor of bananas, isopentyl acetate, CH 3 CO 2 C 5 H 11 2. Calculate the percent by mass of the indicated element in the following compounds. a. H in ascorbic acid (vitamin C), HC 6 H 7 O 6 b. C in capsaicin (C 18 H 27 NO 3 ), the compound that gives the hot taste to chili peppers
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Unformatted text preview: 3. Calculate the following quantities: a. mass of 1.906 x 10-2 mol BaI 2 2 Reyes b. number of O atoms in 4.88 x 10-3 mol Al(NO 3 ) 3 c. molecules of allicin (garlic odor) in 5.00 mg of C 6 H 10 OS 2 4. Determine the empirical formula for a compound that is 62.1% C, 5.21% H, 12.1% N, and 20.7% O. 3 Reyes 5. What is the molecular formula of a compound that has an empirical formula of C 2 H 4 O and a molar mass of 88 g/mol? 6. Determine the molecular formula of ibuprofen if it contains 75.69% C, 8.80% H, and 15.51% O by mass and has a molar mass of about 206 g/mol....
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