31. Calculate the molality of C2H5OH in a water solution that is prepared by mixing 50.0 mL of C2H5OH with 50.0 mL of H2O at 20℃. The density of the C2H5OH is 0.789 g/mL at 20℃.
(A) 17.2 m
(B) 4.28 m
(C) 1.24 m
(D) 8.56 m

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