2. A 0.107 g sample of an unknown diprotic acid is titrated to the equivalence point using 50.0 mL of 0.206 M NaOH. Calculate the molar mass of the acid.
0.00515 g 20.8 g 0.0103 g 36.5 g 147 g
3. The freezing point of compound A is -28oC and its Kf is 6.28. A solution of 25 g of compound B in 1000.g of compound A freezes at -12oC. Find the molecular weight of compound B.
22 g 5.02 g 9.81 g 12.6 g 14.4 g
4. 64 g of a nonvolatile nonelectrolye is dissolved in 2705 g H2O.
11 g 22 g 44 g 66 g 5 g
5. A solution contains the same mass of two substances, substance A, which weights 200 g, and substance B, which weights 50 g. What is the mole fraction of substance A in this solution?
1/5 1/4 4/5 5/4 2/3
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