4) WWW AN Nicotinamide is an important vitamin for metabolism and is soluble in water. The deficiency of this vitamin is pellagra causes a disease called. Nicotinamide 59.0% C by mass; 5.0% H; 22.9% N; 13.1% 0 contains. 3.88 g nicotinamide by adding 30.0 ml nitrobenzene, C6 Hs NO2 (d = 1.204 g/ml) freezing point decreases from 5.7°C to -1.4 °C. What is the molecular formula of this compound? (Kd for nitrobenzene = 8,1°C/m) [Molecular masses (g/mol): Na = 22,9898; Mg = 24,3050; Ag = 107.868; H = 1,00794; C = 12,0107; 0 = 15,9994;)