6. Which would most likely not dissolve in water?(5 points) a. ethanol b. hexane
ID: 1036270 • Letter: 6
Question
6. Which would most likely not dissolve in water?(5 points) a. ethanol b. hexane c. NaCl d. acetone 7. Which compound will form an electrolyte solution dissolved in water? (5 points) a. methanol b. glucose c. chlorine d. sodium chloride when and conduct electricity 8. Gases are more soluble in liquid at: (5 points) a. higher temperature and lower pressure b. lower temperature and lower pressure c. lower temperature and higher pressure d. higher temperature and higher pressure What is the mass percent concentration of a solution containing 30.0 g KCI and 160 mL of water? Assume a density of 1.00 g/mL for water. (5 points) a 2.76% b. 6.20% c. 15.8% d. 13.9% 9. 10. What is the molarity of a solution containing 12.0 g of Ca(NOs )2 in 150 mL of solution??(5 points) a. 64.0 M b. 0.390 M c. 0.064 M d. 0.488 MExplanation / Answer
6) b) Hexane, being a non-polar solvent, does not dissolve in polar solvent like water.
7) d) Sodium Chloride (NaCl) forms Na+ and Cl- ions when dissolved in water and these ions are responsible for conduction of electricity in water.
8) c) Gases are more soluble at low temperature and high pressure. This is because at higher temperature and low pressure, gases molecule gain enough energy to escape the liquid and does have lower solubility.
9) Given the KCl solution has 30 gm KCl and 160 ml water.
For water, Mass= Volume x Density = 160 x 1 = 160 gm
Therefore mass percent of KCl solution = Mass of KCl/ Mass of solution = 30/190 = 15.8%.
Therefore, the correct answer is C.
10) Given mass of Ca(NO3)2 = 12 gm
Molar mass of Ca(NO3)2 = 164 gm
Therfore Number of moles = Given Mass/molar mass = 12/164 = 0.073 moles
Therefore, Molarity = No. of moles/ Volume of solution in L = 0.073/0.15 = 0.488 M
Therefore, the correct answer is D.
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