Name_________________________________
Date_________________Period___________
Chapter 7 Practice Test - Using Chemical Formulas
Answer the following questions on 41 L in your notebook.
1. What does a chemical formula reveal about a compound?
______________________________________________________________________________
2. What are the oxidation numbers in the compound H2S?
3. State the oxidation numbers of each element in the compound NO2.
4. What is the oxidation number of phosphorous in H3PO4?
5. What is the formula mass of magnesium chloride, MgCl2?
6. What is the formula mass of ethyl alcohol, C2H5OH?
7. One mole of phosphorous has a mass of 31 grams. What is the mass of a sample of phosphorous which
contains 3.06 x 1024 atoms?
8. What is the molar mass of (NH4)2SO4?
9. The molar mass of MgI2 is
10. The molar mass of NO2 is 46.01 g/mol. How many moles of NO2 are present in 114.95 g?
11. How many moles of NH3 are present in 107.1 g?
12. How many grams of CCl4 are needed to have 5.000 mol?
13. What is the mass of 0.240 mol glucose, C6H12O6?
14. How many OH– ions are present in 3.00 mol of Ca(OH)2?
15. How many moles of KCl are there in 5.98 1024 molecules?
16. How many molecules are in 116.9 moles of cadmium sulfate?
17. How many molecules are there in 5.0 g of methyl alcohol, CH3OH?
18. What is the mass of 3.011 x 1022 molecules of carbon tetrachloride?
19. What is the percentage composition of CuCl2?
20. What is the percentage composition of Ca(OH)2?
21. A formula that shows the simplest whole-number ratio of the atoms in a compound is the
___________________ ___________________.
22. What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2%
oxygen?
23. Find the empirical formula of a compound that contains 53.70% iron and 46.30% sulfur.
24. What is the empirical formula for a compound that is 43.6% phosphorus and 56.4% oxygen?
25. A compound contains 64 g of O and 8 g of H. What is the empirical formula for this compound?
Name_________________________________
Date_________________Period___________
Chapter 7 Practice Test - Using Chemical Formulas
Answer the following questions on 41 L in your notebook.
1. What does a chemical formula reveal about a compound?
______________________________________________________________________________
2. What are the oxidation numbers in the compound H2S?
3. State the oxidation numbers of each element in the compound NO2.
4. What is the oxidation number of phosphorous in H3PO4?
5. What is the formula mass of magnesium chloride, MgCl2?
6. What is the formula mass of ethyl alcohol, C2H5OH?
7. One mole of phosphorous has a mass of 31 grams. What is the mass of a sample of phosphorous
which contains 3.06 x 1024 atoms?
8. What is the molar mass of (NH4)2SO4?
9. The molar mass of MgI2 is
10. The molar mass of NO2 is 46.01 g/mol. How many moles of NO2 are present in 114.95 g?
11. How many moles of NH3 are present in 107.1 g?
12. How many grams of CCl4 are needed to have 5.000 mol?
13. What is the mass of 0.240 mol glucose, C6H12O6?
14. How many OH– ions are present in 3.00 mol of Ca(OH)2?
15. How many moles of KCl are there in 5.98 1024 molecules?
16. How many molecules are in 116.9 moles of cadmium sulfate?
17. How many molecules are there in 5.0 g of methyl alcohol, CH3OH?
18. What is the mass of 3.011 x 1022 molecules of carbon tetrachloride?
19. What is the percentage composition of CuCl2?
20. What is the percentage composition of Ca(OH)2?
21. A formula that shows the simplest whole-number ratio of the atoms in a compound is the
___________________ ___________________.
22. What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2%
oxygen?
23. Find the empirical formula of a compound that contains 53.70% iron and 46.30% sulfur.
24. What is the empirical formula for a compound that is 43.6% phosphorus and 56.4% oxygen?
25. A compound contains 64 g of O and 8 g of H. What is the empirical formula for this compound?