The organic compound aluminon is used as a reagent to test for the presence of the aluminum ion in aqueous solution. A solution of 2.50 g of aluminon in 50.0 g of water freezes at -0.197 °C. What is the molar mass of aluminon? The normal freezing point for water is 0.000 °C, and Kfp for water = 1.86 °C/m.
A) 121.2 g/mol
B) 176.5 g/mol
C) 205.4 g/mol
D) 238.6 g/mol