a) In the parallel reactions given below, how much of 4 mol Glucose is converted to Pyruvic acid and how much to lactic acid is given together with the rate constants determined for each reaction. Calculate the molar fraction of Pyruvic acid after 2 hours if the initial Glucose concentration is 0.5 M. (k1 = 1.5 x 10-3 min-1; k2 = 4.5 x 10-2 min-1)