Physical Chemistry Solutions Partial Molar Quantities Partial molar volumes mn+nym2+…+nm=∑nm (9.4) V(H,O)/cm cm 7550250 The star indicates a property 1001 of a pure substance or a collection of pure substances 99 Addition of 50.0 cm of water to 98 50.0 cm of ethanol at 20 oC and 97 I atm gives a solution of 96.5 cm(Fig. 9.1, left) 96 0255075100 (ethanol)cm ≠卩Partial Molar Quantities Solutions The star indicates a property of a pure substance or a collection of pure substances. = + + + = i V nVm n Vm nr Vm r ni Vm i * , * , * 2 ,2 * 1 ,1 *  (9.4) Partial Molar Volumes 0 25 50 75 100 V (ethanol)/cm3 100 99 98 97 96 75 50 25 0 V (H2O)/cm3 V /cm3 Addition of 50.0 cm3 of water to 50.0 cm3 of ethanol at 20 oC and 1 atm gives a solution of 96.5 cm3 (Fig. 9.1, left). * V  V Physical Chemistry