126. Solving a chemistry problem

2. Construct a melting diagram for the o-dinitrobenzene (A) -n-dinitrobenzene (B) system based on the following data:
A, wt% 0 20 40 70 80 90 100
B, wt. % 100 80 60 30 20 10 0
T, C (beginning crystal.) 174 161 146 112 104 107 117
Determine the coordinates of the eutectic point. Calculate how many grams of o-dinitrobenzene must be added to 15 g of n-dinitrobenzene to lower its solidification temperature to 112 C. Determine the solubility of o-dinitrobenzene in n-dinitrobenzene at 419 K.