<p> CHM 130 PRACTICE WORKSHEET #4 </p><p>1. How many grams of oxygen gas will react with 61.0 grams of methane, CH4. (unbalanced)</p><p>CH4 + O2  CO2 + H2O</p><p>. 2. Calculate the percent of water in CaCl2 6H2O.</p><p>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.</p><p>4. Calculate the mass in grams of 2.50 moles of ammonia, NH3.</p><p>5. Calculate the molecular mass of (NH4)3PO4.</p><p>6. Calculate the number of moles of methyl alcohol, CH3OH, in 50.0 grams of the alcohol.</p><p>7. What volume will 6.0 moles of water occupy at 4.00C?</p><p>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.</p><p>9. Calculate the number of moles of oxygen gas formed by the</p><p> decomposition of 61.0 grams of potassium chlorate, KClO3.</p><p>2KClO3  2KCl + 3O2</p><p>10. How many grams of oxygen gas is needed for the combustion of 40.0 grams </p><p> of butane, C4H10. (unbalanced)</p><p>C4H10 + O2  CO2 + H20</p><p>11. Calculate the molarity of a sulfuric acid solution prepared by dissolving </p><p>80.0 grams of H2SO4 in enough water to make 650. mL solution. 12. Calculate the number of moles of sodium sulfate contained in</p><p>200. mL of 2.50 M Na2SO4 solution.</p><p>13. Calculate the molarity of a solution prepared by the dilution of 200. mL of 6.0 M NaOH solution to 450. mL.</p><p>14. Calculate the volume of 0.40 M NaHCO3 solution that contains</p><p>100.0 grams of NaHCO3.</p><p>15. Calculate the percent of sugar in a solution that is prepared by dissolving 70.5 grams of sugar in 100. grams of water.</p><p>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.</p><p>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)</p><p>NaClO3  NaCl + O2</p><p>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.</p><p>19. Calculate the number of moles of calcium carbonate contained in 600.0 mL </p><p> of 0.400 M CaCO3 solution.</p><p>20. How many milliLiters of 6.0 M HCl solution must be diluted to make 80.0 mL of 0.50 M HCl?</p><p>21. How many grams of sulfur dioxide are produced when 20.0 of carbon disulfide burns in oxygen gas.</p><p>CS2 + 3O2 -  CO2 + 2SO2</p><p>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.</p><p>24. Calculate the number of grams of NaOH in 200. grams of 20.0% by weight NaOH in water.</p><p>25. How many grams of oxygen can be prepared by the decomposition of 0.40 moles of potassium chlorate? (unbalanced)</p><p>KClO3  KCl + O2</p><p>26. Calculate the molarity of a nitric acid solution prepared by dissolving </p><p>80.0 grams of HNO3 in enough water to make 780. mL of solution.</p><p>27. Calculate the number of moles of sodium bicarbonate contained in 450. mL </p><p> of 0.750 M NaHCO3 solution.</p><p>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.</p><p>29. Calculate the number of grams in Na2SO4 in 500.0 mL of 2.50 M sodium sulfate solution.</p><p>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.</p><p>31. Calculate the number of moles of oxygen gas formed by the decomposition </p><p> of 100. grams of sodium chlorate, NaClO3. (unbalanced)</p><p>NaClO3  NaCl + O2</p><p>32. Calculate the number of grams of sodium chloride formed by the </p><p> decomposition of 100. grams of sodium chlorate, NaClO3. 33. How many grams of water will be produced by the combustion of 50.0 grams</p><p> of butane, C4H10. (unbalanced)</p><p>C4H10 + O2  CO2 + H2O</p><p>34. Calculate the molarity of a phosphoric acid solution prepared by </p><p> dissolving 80.0 grams of H3PO4 in enough water to make 850. mL of solution.</p><p>35. Calculate the number of moles of ammonium hydroxide contained in 300. mL</p><p> of 2.50 M NH4OH solution.</p><p>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.</p><p>37. Calculate the number of grams in K2SO4 in 350.0 mL of 3.00 M potassium sulfate solution.</p><p>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.</p><p>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.</p><p>40. Calculate the number of moles of sodium chlorate needed to prepare 100. </p><p> grams of oxygen gas, O2. (unbalanced)</p><p>NaClO3  NaCl + O2</p><p>41. How many grams of oxygen gas, O2, will react with 50.0 grams of carbon </p><p> disulfide, CS2? (unbalanced)</p><p>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.</p><p>43. Calculate the volume of a 6.50 M HCl solution needed to prepare 400. mL of 2.50 M HCl by dilution.</p><p>44. Calculate the number of grams of HC2H3O2 in 150.0 mL of 6.0 M acetic acid solution.</p><p>45. Write the net ionic reaction for the following reaction.</p><p>H2SO4 + 2NaOH  Na2SO4 + 2H2O</p><p>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).</p><p>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.</p><p>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.</p><p>49. Calculate the pH, pOH, and [H+] concentrations missing in the table. [H+] pH pOH</p><p>_____ 3.0 _____</p><p>0.10 ______</p><p>______</p><p>50. How many grams of carbon dioxide gas will be produced by the</p><p> combustion of 50.0 grams of propane, C3H8. (unbalanced)</p><p>C3H8 + O2  CO2 + H2O</p>