Lecture 17, Percent Composition
- Calculate the percent mass of each element for the given chemical formula:
- Determination of Formula:
- What is the emperical formula of a salt. 100.0000 grams of salt is analyzed and found to contain:
- >39.3374 grams of sodium
- 60.6626 grams of chloride
- What is the emperical formula of an alcohol. 69.8457 grams of AN alcohol is analyzed and found to contain:
- 41.9124 grams carbon
- 9.3234 grams hydrogen
- 18.6100 grams oxygen
- What is the molecular formula of the alcohol if:
- MW = 60.05 grams/mole
- MW = 120.10 grams/mole
- 1 asprin tablet contains 325 mg of acetylsalicylic acid (C9H8O4, see page 220 in textbook for structure).
- How many moles of asprin, carbon, hydrogen, and oxygen are in a single tablet?
- How many atoms(molecules) of asprin, carbon, hydrogen and oxygen are in a single tablet?
- What is the percent composition of acetylsalicylic acid?
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