Ebulliometry

Exercise 1

→   Cryoscopic and ebullioscopic constants

The addition of $35.1\;g$ glucose in $100\;g$ water causes elevation of the boiling temperature of $1.0 ^ oC$. What is the molar mass of glucose?

$w$=water et $g$= glucose $\mu_g$ $=$ $\frac{1000\cdot n}{m_w}$ $=$ $\frac{1000\cdot m_g}{M_g\cdot m_w}$ $\Delta T$ $=$ $K_{eb}\mu_g$ so: $M_g$ $=$ $\frac{K_{eb}\cdot 1000\cdot m_g}{m_w\Delta T}$ $=$ $\frac{1000\cdot 0.512\cdot 35.1}{1\cdot 100 }$ $\approx$ $180\frac{g}{mol}$