19.1 A weighed portion of a mixture of m g of alanine (M = 89.09 g/mol) and phenylalanine (M = 165.2 g/mol) was dissolved and the solution was made up to the mark with glacial acetic acid in a 50.00 ml volumetric flask. 5.00 ml of 0.1 M HCl04 (K = 0.828) in anhydrous acetic acid gave the following results:
V(HCl4), ml 3.00 3.20 3.40 3.60 3.80 4.00 4.20
E, mV, at m = 0.3933 g 432 444 466 580 624 640 650
E, mV, at m = 0.3702 g 434 445 470 556 596 612 624
Calculate the mass fraction (%) of the components of the mixture.

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