what concentration unit is used in the calculation of osmotic pressure for a dil
ID: 1080974 • Letter: W
Question
what concentration unit is used in the calculation of osmotic pressure for a dilute 22. Which of the following favors) the solubality of an ionic solid in a liquid solveat a. a small magnitude of the lattice energy of the solute b. a large magnitude of the solvation energy of the ions c. a large polarity of the solvent d. all of the above e. none of the above 23. The change in energy accompanying the process below is theo MX(s) M+(aq) + X-(aq) a. enthalpy of solution b. lattice energy c. enthalpy of formation 11-3 24. Which of the following compounds is not a. CH3NH2 b. CH3COOH c.CCl d. CH3CN e.HOCH CH2OH of NazCO3 is 106.0 g/mol. Assume the density of the solution is 1.00 g'ml. a. 8.28 x 106M b. 1.21 x 10 M c. 1.36 x 10 M d. 0.136 M e. 0.121 M 25. If the concentration of sodium carbonate in water is 128 ppm, what is the molarity of NasC0fag? The molar massExplanation / Answer
22. Ans (d)
low lattice energy promotes easier solubility,so as the polarity
23. Ans (a) when a solid dissociates into aq ions
24. Ans (c) water is polar and like dissolves like as the CCl4 is non polar and hence water won't dissolve it
25. Ans(b)
12.8 ppm = 12.8 g per 106 g
12.8g Na2CO3 = 12.8g / 106.0g/mol = 0.121 mol
total volume = mass / density = 106 g/1.00g/mL = 106 mL = 103 L
molarity = moles of solute / volume in litres = 0.121 mol / 103 L = 1.21 x 10-4 M
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