Name:
Show work and circle final answers with units
1. How many grams are 0.024 moles of copper (II) chloride?
2. How many grams are 2.36 moles of nickel?
3.How many grams is 3.94 moles of sodium chloride?
4. How many moles are 250.0 grams of sulfuric acid?
5. How many moles are 456.7 grams of magnesium iodide?
6. How many moles are 23.8 grams of aluminum oxide?
7. How many atoms are there in 6.50 grams of silver?
8. Determine the number of formula units in 859.43 grams of iron (II) oxide?
9. Find the mass of 5.6 x 1025 molecules of oxygen?
10. What is the mass of 0.056 moles of silver nitrate?
11. What is the percent composition of the atoms in the following molecule: Sillver nitrate
12. Determine the mass of lithium hydroxide produced when 0.38 g of lithium nitride reacts with
water according to the following equation:
Li3N +
H2O  NH3 + LiOH
13. What mass of sodium chloride is produced when chlorine reacts with 0.295 g of sodium
iodide?
14. Identify the limiting reactant when 1.22 g of O2 reacts with 1.05 g of H2 to produce water.
What is in excess? How much in grams is left in excess?
15. What is the % Yield if 1.25 g of water is actually produced?
A solution of silver nitrate is added to a solution of magnesium bromide. Predict the products
(including phase indicators), then write a balanced chemical equation and refer to it to answer
the following (show all work including units, labels, and Sig Figs count!!!):
16. Determine the number of moles of silver bromide formed when 8.65 moles of magnesium
bromide react.
17. How many grams of silver nitrate reacted if 163g of silver bromide were formed?
18. How many molecules of silver bromide were produced if 2.3mol of magnesium bromide were
consumed?
19. How many grams of magnesium bromide are needed to produce 67.9g silver bromide?
20, A reaction takes place between 6.92 g K and excess oxygen gas. What is the theoretical
amount of potassium oxide that can be produced? What is the % yield if 7.36 g of potassium
oxide is actually produced?
20. The percentage composition of an acid is found to be 39.9% C, 6.7% H, and 53.4% O.
Determine the empirical formula.
21. The molar mass for question #20 was determined by experiment to be 60.0 g/mol. What is
the molecular formula?
22. An unknown compound has a molar mass of 180.15g/mol. The percent composition is carbon
40.0%, Hydrogen 6.7% and oxygen 53.3%.
Find the empirical and molecular formula of the substance above