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Chemistry Help? A saturated aqueous solution of sodium bromide (NaBr) at 20 oC contains 116 grams of NaBr per?

• A saturated aqueous solution of sodium bromide (NaBr) at 20 oC contains 116 grams of NaBr per 100 grams of water. Express the concentration of this solution as percent by mass of NaBr. Answer a. 11.6% b. 53.7% c. 116% d. 43.5% e. 66.5% Which of the following is likely to be soluble in carbon tetrachloride? Answer a. NaCl b. KCl c. C2H6 d. H2O e. HF How many grams of glucose (C6H12O6) would you need to prepare 2.0 liters of 2.0% glucose solution. The density of this solution is 1.08 g/mL. Answer a. 20 g b. 40 g c. 65 g d. 43 e. 108 g Carbon disulfide was once a widely used cleaning agent, which has now been found to be carcinogenic. Which of the following substances is least likely to dissolve in carbon disulfide? Answer a. C7H16 b. CCl4 c. KBr d. CO2 e. C6H6 The physiologic saline solution used in hospitals is 0.90% NaCl (mass of NaCl per volume of the solution). What is its molarity? Answer a. 1.2 M b. 0.87 M c. 0.15 M d. 3.2 M e. 7.5 M What is the molarity of a solution made by dissolving 2.0 moles of glucose(C 6H12O6) in enough water to give 6.6 liters of the solution? Answer a. 2.0 M b. 0.30 M c. 6.6 M d. 3.3 M e. 0.85 M A solution is prepared by dissolving 8.75 grams of sodium chloride in enough volume of water to produce 112.0 grams of the NaCl solution, what is the percent by mass of the solution? Answer a. 8.75% b. 8.12% c. 85.4% d. 7.81% e. 12.5% How many moles of solute are present in 1.5 liters of 1.33 M of Na2SO4? Answer a. 1.1 moles b. 1.8 moles c. 2.4 moles d. 1.5 moles e. 2.0 moles Which of the following statements is incorrect? Answer a. Both compounds and solutions are homogeneous. b. Both compounds and solutions can be separated by physical means. c. Compounds have constant properties, but solutions have variable properties. d. Compounds have constant composition, but solutions have variable composition. e. The particles in both compounds and solutions are uniformly distributed. A certain vinegar is 6.02% acetic acid (HC2H3O2), by mass. How many grams of acetic acid are contained in a 355 mL bottle of vinegar. Assume a density of 1.01 g/mL. Answer a. 21.6 g b. 6.02 g c. 1.01 g d. 18.06 g e. 38.5 g How many grams of potassium nitrate are present in 5.0 x 102 mL of 0.080M KNO3? Answer a. 4.0 g b. 6.8 g c. 12 g d. 2.1 g e. 0.05 g Which of the following statements is incorrect? Answer a. A solvent dissolves another substance. b. A solution is a heterogeneous mixture. c. A solution can contain more than one solute. d. A solute is a substance that is dissolved in another substance. e. Two immiscible liquids do not form a solution. The solubility of NaCl in water at 30 oC is 37.0 g per 100 mL of water. When 12.0 g of NaCl is mixed with 40.0 mL of water, which of the following best describes the combination? Answer a. A saturated solution is formed. b. A saturated solution is formed and solid remains. c. A supersaturated solution is formed. d. A heterogeneous mixture is formed. e. An unsaturated solution is formed. 10 Points to whoever can help me!! Thank you!

• Answer:

  I'm not going to show detailed work for these; its to much to write out. I actually already did number 1 for you in another question. 1. B. (116g / 216g) *100 = 53.7% 2. C. Both CF4 and C2H6 are nonpolar. 3. D. (2000*1.08)/50 = 43.2 4. C. KBr is polar and CS2 is nonpolar. Therefore KBr is least likely to dissolve CS2 5. C. 9g/ 1000ml = 0.009 0.15/1 = .15M 6. B. 2/6.6 = 0.3M 7. D. (8.75 / 112) *100 = 7.81% 8. E. 1.5 * 1.33 = 2moles 9. A. I think 10. 21.6g ((355*1.01) / 100) * 6.02 = 21.6g 11. A. 0.4 * molar mass 12. B 13. B