Calculate the Molality of C₂H₅OH in a Water Solution That

Calculate the molality of C₂H₅OH in a water solution that is prepared by mixing 50.0 mL of C₂H₅OH with 112.7 mL of H₂O at 20°C.The density of the C₂H₅OH is 0.789 g/mL at 20°C.(Assume the density of water at this temperature is 1.00 g/mL. )

A) 0.00963 m
B) 0.155 m
C) 0.132 m
D) 7.60 m
E) 9.63 m