CHM 130 - Quartzland
CHM 130
PRACTICE WORKSHEET #4
1. How many grams of oxygen gas will react with 61.0 grams of methane, CH4.
(unbalanced)
CH4 + O2 ( CO2 + H2O
2. Calculate the percent of water in CaCl2 . 6H2O.
3. A sample of metal oxide having a mass of 3.60 grams was found to contain 2.20 grams of oxygen. Calculate the percent of oxygen in the metal oxide.
4. Calculate the mass in grams of 2.50 moles of ammonia, NH3.
5. Calculate the molecular mass of (NH4)3PO4.
6. Calculate the number of moles of methyl alcohol, CH3OH, in 50.0 grams of the alcohol.
7. What volume will 6.0 moles of water occupy at 4.00C?
8. Calculate the empirical formula and the molecular formula for lactic acid.
It has a molecular mass of 90 grams/mole and a composition of 40.0%
carbon, 6.71% hydrogen and 53.29% oxygen.
9. Calculate the number of moles of oxygen gas formed by the decomposition of 61.0 grams of potassium chlorate, KClO3.
2KClO3 ( 2KCl + 3O2
10. How many grams of oxygen gas is needed for the combustion of 40.0 grams of butane, C4H10.
(unbalanced)
C4H10 + O2 ( CO2 + H20
11. Calculate the molarity of a sulfuric acid solution prepared by dissolving
80.0 grams of H2SO4 in enough water to make 650. mL solution.
12. Calculate the number of moles of sodium sulfate contained in
200. mL of 2.50 M Na2SO4 solution.
13. Calculate the molarity of a solution prepared by the dilution of 200. mL of
6.0 M NaOH solution to 450. mL.
14. Calculate the volume of 0.40 M NaHCO3 solution that contains
100.0 grams of NaHCO3.
15. Calculate the percent of sugar in a solution that is prepared by dissolving
70.5 grams of sugar in 100. grams of water.
16. An alloy of gold and nickel contains 60.0% nickel. Calculate the mass of
alloy that can be prepared from 50.0 grams of gold.
17. Calculate the number of moles of oxygen gas formed by the decompostion
of sodium chlorate if the reaction produces 50.0 grams of NaCl.
(unbalanced)
NaClO3 ( NaCl + O2
18. Calculate the molarity of a sodium hydroxide solution prepared by dissovling 100.0 grams of NaOH in enough water to make 500.0 mL of solution.
19. Calculate the number of moles of calcium carbonate contained in 600.0 mL of 0.400 M CaCO3 solution.
20. How many milliLiters of 6.0 M HCl solution must be diluted to make 80.0 mL of 0.50 M HCl?
21. How many grams of sulfur dioxide are produced when 20.0 of carbon disulfide burns in oxygen gas.
CS2 + 3O2 - ( CO2 + 2SO2
22. Calculate the number of grams of H2SO4 in 50.0 mL of 4.0 M sulfuric acid.
23. Calculate the mass percent of sufuric acid in a solution prepared by dissolving 40.0 grams of sulfuric acid in 100. grams of water.
24. Calculate the number of grams of NaOH in 200. grams of 20.0% by weight NaOH in water.
25. How many grams of oxygen can be prepared by the decomposition of 0.40 moles of potassium chlorate?
(unbalanced)
KClO3 ( KCl + O2
26. Calculate the molarity of a nitric acid solution prepared by dissolving 80.0 grams of HNO3 in enough water to make 780. mL of solution.
27. Calculate the number of moles of sodium bicarbonate contained in 450. mL of 0.750 M NaHCO3 solution.
28. Calculate the volume of 0.75 M NaOH that can be prepared by the dilution of 200. mL of 6.0 M NaOH solution.
29. Calculate the number of grams in Na2SO4 in 500.0 mL of 2.50 M sodium sulfate solution.
30. An alloy of gold and nickel contains 60.0% nickel. Calculate the mass of alloy
that can be prepared from 700. grams of nickel.
31. Calculate the number of moles of oxygen gas formed by the decomposition of 100. grams of sodium chlorate, NaClO3.
(unbalanced)
NaClO3 ( NaCl + O2
32. Calculate the number of grams of sodium chloride formed by the
decomposition of 100. grams of sodium chlorate, NaClO3.
33. How many grams of water will be produced by the combustion of 50.0 grams of butane, C4H10.
(unbalanced)
C4H10 + O2 ( CO2 + H2O
34. Calculate the molarity of a phosphoric acid solution prepared by dissolving 80.0 grams of H3PO4 in enough water to make 850. mL of solution.
35. Calculate the number of moles of ammonium hydroxide contained in 300. mL of 2.50 M NH4OH solution.
36. Calculate the volume of 1.50 M H2SO4 that can be prepared by the dilution of 150. mL of 3.0 M sulfuric acid solution.
37. Calculate the number of grams in K2SO4 in 350.0 mL of 3.00 M potassium sulfate solution.
38. Calculate the percent of sodium hydroxide in a solution that is prepared by
dissolving 30.0 grams of NaOH in 100. grams of water.
39. An alloy of silver and nickel contains 30.0% silver. Calculate the mass of
alloy that can be prepared from 50.0 grams of silver.
40. Calculate the number of moles of sodium chlorate needed to prepare 100. grams of oxygen gas, O2.
(unbalanced)
NaClO3 ( NaCl + O2
41. How many grams of oxygen gas, O2, will react with 50.0 grams of carbon disulfide, CS2?
(unbalanced)
CS2 + O2 ( CO2 + SO2
42. Calculate the number of grams of NaCl that is contained in 90.0 grams of solution which is 20.0 percent by mass NaCl.
43. Calculate the volume of a 6.50 M HCl solution needed to prepare 400. mL of 2.50 M HCl by dilution.
44. Calculate the number of grams of HC2H3O2 in 150.0 mL of 6.0 M acetic acid solution.
45. Write the net ionic reaction for the following reaction.
H2SO4 + 2NaOH ( Na2SO4 + 2H2O
46. Calculate the molarity of a sodium hydroxide solution that requires
32.5 mL of NaOH to neutralize 2.60 grams of KHP (204 grams/mole).
47. Calculate the percent of salt in a solution that is prepared by
dissolving 25.0 grams of salt in 100.0 grams of water.
48. Calculate the molarity of a sodium hydroxide solution prepared by dissolving 60.0 grams of NaOH in enough water to make 750.0 mL of solution.
49. Calculate the pH, pOH, and [H+] concentrations missing in the table.
[H+] pH pOH
_____ 3.0 _____
0.10 _____ _____
_____ _____ _____
50. How many grams of carbon dioxide gas will be produced by the
combustion of 50.0 grams of propane, C3H8.
(unbalanced)
C3H8 + O2 ( CO2 + H2O
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