45) Calculate the molarity, mass percent and percent by volume of A solution is made by mixing 100. 0 g of butanone, CH3COCH2CH3 (molar mass=72. 11 g/mol; density= 0. 805 g/mL) and 50. 0 g methanol, CH3OH (molar mass=32. 04 g/mol; density=0. 793 g/mL). Start by determining which is the solute and which is the solvent.