$0.5\;$ g of a compound were dissolved in $50\;g$ benzene. This solution freezes at $0.44^ oC$ lower than the pure benzene. What is the molar mass of this compound?
→ Cryoscopic and ebullioscopic constants
Let be $b$=benzene and $s$= solute $\mu_s$ $=$ $\frac{1000\cdot n}{m_b}$ $=$ $\frac{1000\cdot m_s}{M_s\cdot m_b}$ $\Delta T$ $=$ ${fus}\mu_s$ d'oł: $M_s$ $=$ $\frac{K_{fus}\cdot 1000\cdot m_s}{m_b\Delta T}$ $=$ $\frac{1000\cdot 4,90\cdot 0,5}{0,44\cdot 50 }$ $=$ $111\frac{g}{mol}$
