Please do your work on another piece of paper and show your work so that you can refer to it later to check for mistakes and use for review. 1.
What is the empirical formula for: a. sucrose (C11H22O11)? b. glucose (C6H12O6)?
2.
A compound is formed from 0.27 moles of carbon and 1.08 moles of chlorine. What is the empirical formula?
3.
A 10.00 g sample of an ionic compound is composed of 4.94 g of potassium, 2.03 g of sulfur, and the remainder is oxygen. a. What is the empirical formula? b. Name this compound.
4.
Consider a compound made of silver and fluorine that is 85% silver. a. What percent of this compound is composed of fluorine? b. What is the empirical formula of this compound? c. Name this compound.
5.
The composition of a compound is 40% sulfur and 60% oxygen by weight. a. What is the empirical formula? b. Name this compound.
6.
An ionic compound was found to be 24.58% potassium, 34.81% manganese, and the remainder is oxygen. a. What is the empirical formula? b. Name this compound.
7.
An ionic compound was analyzed and determined to be 37.70% sodium, 22.95% silicon, and 39.34% oxygen. a. What is the empirical formula? b. Name this compound.
8.
Analysis of an ionic compound was found to be 21.20% nitrogen, 6.06% hydrogen, 24.3% sulfur, and 48.45% oxygen. a. What is the empirical formula? (Hint: this compound is made from two polyatomic ions.) b. Name this compound.
9.
Your teacher’s favorite molecule, caffeine, has an elemental analysis of 49.48% carbon, 5.190% hydrogen, 16.47% oxygen, and 28.85% nitrogen. a. What is the empirical formula? b. Caffeine has a molar mass of 194.19 g/mol. What is the molecular formula of caffeine?
10. A compound is 54.5% carbon, 9.1% hydrogen and 36.4% oxygen. a. What is the empirical formula? b. If the molar mass of this substance is 132 g/mol, what is its molecular formula?
1
Duell
P F.6
Determining Empirical & Molecular Formulas
Answers
1. a. b. 2.
CH2O CH2O
Sucrose and glucose have very similar properties. Notice that their empirical formulas are identical…
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