51. Solving a chemistry problem

2. For two aqueous solutions of ascorbic acid with its content X1=4.44% and X2=6.36%, the values of the refractive index nD20 were found, respectively, nl =1.3400, n2=1.3430, and for the analyzed solution n= 1.3420.
Calculate the content of ascorbic acid in the analyzed solution, if the value of the refractive index of a pure solvent - water, determined under the same conditions, is 1.3330.