Calculations REVIEW SHEET for Final Exam

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Feb 20, 2024

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Calculations REVIEW SHEET for Final Exam CHM101 1. Calculate the molar mass of sulfur dioxide. 64.07 g/mol sulfur dioxide 2. How many moles of carbon are there in CO 2 ? 1 mole of Carbon 3. What is the percent-by-mass concentration of sugar in a solution made by dissolving 67.8 g of sugar in 500 g of solution? 13.56 %(m/m) sugar 4. Find the pH of a solution if the hydroxide ion concentration is 1.0 x 10-9 pH = 5 5. What is the TOTAL number of molecules in 3.4 g of sodium chloride? 3.50 x 10 22 molecules of sodium chloride 6. Given the equation: CO + NaCN Na 2 CO 3 + C + N 2 a) Balance the equation: 3, 2, 1, 4, 1 b) How many moles of carbon monoxide are needed to produce 4.0 moles nitrogen? 12 moles carbon monoxide 1
7. How many grams of hydrogen are there in 3 moles of trihydrogen phosphate? 9.09 grams of hydrogen 8. What is the TOTAL number of oxygen ions are there in 4 moles of hydrogen perchlorate? 9.63 x 10 24 oxygen ions 9. Given the equation: CuO Cu + O 2 a) Balance the equation 2, 2, 1 b) How many grams of oxygen can be obtained by the decomposition of 7.00 moles of copper (II) oxide? 112 g oxygen 2
10. Given: 57.2 g of NH 4 Br is dissolved in enough water to give 2.15 L of solution. Find the molarity of the solution. 0.27 M solution 11. What is the TOTAL number of hydrogen atoms are there in 1 mole of acetic acid? 2.41 x 10 24 hydrogen atoms 12. Quinine, one of the most important antimalarial agents, is isolated from the bark of the cinchona tree. The elemental composition of quinine is 74.04% carbon, 7.46% hydrogen, 8.64% nitrogen, and 9.86% oxygen. Determine the empirical formula of quinine. C 10 H 12 NO 3
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13. Given the equation: Mg + N 2 Mg 3 N 2 a) Balance the equation 3, 1, 1 b) How many grams of magnesium nitride can be produced from 10.0 grams of magnesium? 14.13 g magnesium nitride c) How many grams of magnesium nitride can be produced from 10.0 grams of nitrogen? 35.33 g magnesium nitride 4
d) State the limiting reactant Magnesium 14. How many moles are there in 200 grams of gold? 1.02 moles gold 15. Normal saline solution is 0.92 %(m/v). How many grams of sodium chloride are required to prepare 250 mL of normal saline solution? 2.3 g sodium chloride 16. A typical dose if FeSO 4 used in the treatment of iron-deficiency anemia is 0.35 g. How many milliliters of a 0.10 M iron (II) sulfate solution would be needed to supply this dose? 23 mL iron (II) sulfate solution 17. After sprinting full out for 200 m you felt the “burn” – lactic acid! The elemental composition of lactic acid is 40.00% carbon, 6.71% hydrogen, and 53.29% oxygen, and it has a molar mass of 90.0 amu. What is the molecular formula of lactic acid? P.S. My personal best for the 200 m is 26.4 seconds. C 3 H 6 O 3 5
18. What is the mass of 5.67 x 10 25 silver atoms? 10160.28 g of silver atoms 19. Determine the number of grams of oxygen present in 20 g of sulfuric acid. 13.05 g oxygen 20. Find the hydroxide ion concentration if the concentration of the hydronium ion is 5.3 x 10 -4 M. 1.89 x 10 -11 M hydroxide 21. Find the pH of a solution if the hydronium ion concentration is 1.0 x 10-9. pH = 9 22. Calculate the formula weight of nitric acid. 63.02 amu 23. Is the solution acidic, basic, or neutral if the pH of a solution is 3? acidic 24. How many grams are there in 1.5 moles of hydrogen gas? 3.03 grams hydrogen gas 6
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25. Find the pH of a solution if the hydronium ion concentration is 4.5 x 10 4 . Is the solution acidic, basic, or neutral? pH between 3-4, acidic 26. How many moles of carbon dioxide gas are in 132g? 3 moles carbon dioxide gas 27. What is the percent-by-mass concentration of salt in a solution made by dissolving 4.6 g of sodium chloride in 40 g of water? 10.31 %(m/m) NaCl 28. What is the molarity of a solution if 1.45 moles of KCl is dissolved in enough water to give 875 mL of solution? 1.66 M solution 29. If it takes 83 mL of a 0.45 M NaOH solution to neutralize 235 mL of an HCl (aq) solution. What is the concentration of the HCl (aq) solution? 0.16 M HCl 7
30. Given the equation: SiO 2 + C SiC + CO a) Balance the equation 1, 3, 1, 2 b) How many grams of silicon dioxide are needed to react with 1.50 moles of carbon? 30.05 g silicon dioxide 31. How many mL of a NaCl solution is required to make a 250 mL of 0.100 M NaCl solution. Your stock solution is 2.00 M. 12.5 mL NaCl solution 32. A 3.00L helium balloon, initially at STP, floats up to an altitude of 10 km, where the pressure is 200.0 torr and the temperature is -45 degrees Celsius. What is the balloon’s new volume? 9.52 L 8
33. Give the equation 2 S + O 2 2 SO 2 9.75 g of SO 2 was obtained out of a possible 11.2 g of SO 2 . a) What is the theoretical yield of SO 2 ? 11.2 g b) What is the actual yield of SO 2 ? 9.75 g c) What is the percent yield of SO 2 ? 87.1% 34. Calculate the volume of 0.100 mole of oxygen gas at 0 degrees Celsius and 2 atmospheric pressure. 1.12 L oxygen gas 9
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35. A sample of chlorine gas is loaded into a 0.25 L bottle at standard temperature and pressure. How many moles of bromine gas are in the container? 0.011 moles chlorine gas How many grams of bromine gas are in the container? 0.78 grams chlorine gas 36. Find the molarity of acetic acid given the concentration of sodium hydroxide is 2M. 2.33 M acetic acidic Acetic Acid Sample # 1 Volume of acetic acid used 30 mL Buret reading, start 10 mL Buret reading, end 45 mL Volume of sodium hydroxide used You calculate Molarity of Acetic Acid You calculate 10

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