Which would most likely not dissolve in water?(5 points) a. ethanol b. hexane c.
ID: 1036759 • Letter: W
Question
Which would most likely not dissolve in water?(5 points) a. ethanol b. hexane c. NaCl d. acetone 6. 7. Which compound will form an electrolyte solution and conduct electricity when dissolved in water? (5 points) a. methanol b. glucose c. chlorine d. sodium chloride 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(NO,2 in 150 mL of solution??(5 points) a. 64.0 M b. 0.390 M c. 0.064 M d. 0.488 M Bonus Points( 10 points): Write a paper describing how the ideal gas law equation (PV nRT) was derived and how was the value of R (0.0821 liter-atm/mole-K) obtained. Attach the paper to your exam.Explanation / Answer
6. Option B, Hexane, since it non polar and water is polar solvent. Like dissolves in like solvent.
7. Option D, NaCl since it is strong electrolyte and completely undergo disassociation and conduct electricity by free motion of Na+& Cl- ions.
8. Option C, a/c to Henry's law, solubility of gas is directly proportional to pressure and inversely proportional to temperature.
9. Option C
% Mass= mass of solute x100 / mass of solute and solvent
% Mass = 30 x 100/30+160= 3000/190= 15.8 %
10. Option D
Molarity = no of moles x Volume
= mass x 1000/Molar mass x volume
= 12x 1000/164x150
=0.488 M
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