1. Calculate the percent by mass of chromium in each of the following oxides: (a) CrO3 (b) Cr₂O3 2. A commercial mouthwash contains 4.3 g of ethanol and 0.021g antiseptic in each 30.-mL portion. Calculate the w/v percent concentration of each component. 3. How many mL of ethanol are contained in a 30.-mL portion of mouthwash that has 8.0% (v/v) of ethanol? 4. A cough medicine contains 0.20% (w/v) dextromethorphan, a cough suppressant, and 2.0% (w/v) guaifenesin, an expectorant. How many mg of each drug would you obtain from 3.0 tsp of cough syrup? (1 tsp = 5 ml)
1. Calculate the percent by mass of chromium in each of the following oxides: (a) CrO3 (b) Cr₂O3 2. A commercial mouthwash contains 4.3 g of ethanol and 0.021g antiseptic in each 30.-mL portion. Calculate the w/v percent concentration of each component. 3. How many mL of ethanol are contained in a 30.-mL portion of mouthwash that has 8.0% (v/v) of ethanol? 4. A cough medicine contains 0.20% (w/v) dextromethorphan, a cough suppressant, and 2.0% (w/v) guaifenesin, an expectorant. How many mg of each drug would you obtain from 3.0 tsp of cough syrup? (1 tsp = 5 ml)
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:1. Calculate the percent by mass of chromium in each of the following oxides: (a) CrO3 (b) Cr₂O3
2. A commercial mouthwash contains 4.3 g of ethanol and 0.021g antiseptic in each 30.-mL portion. Calculate the w/v percent
concentration of each component.
3. How many mL of ethanol are contained in a 30.-mL portion of mouthwash that has 8.0% (v/v) of ethanol?
4. A cough medicine contains 0.20% (w/v) dextromethorphan, a cough suppressant, and 2.0% (w/v) guaifenesin, an expectorant.
How many mg of each drug would you obtain from 3.0 tsp of cough syrup? (1 tsp = 5 ml)
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