Question

S.I unit of ebullioscopic constant is :

• A. $K^{-1}kgmo{l}^{-1}$
• B. $Kkgmo{l}^{-1}$
• C. $Kk{g}^{-1}mo{l}^{-1}$
• D. $K^{-1}k{g}^{-1}mo{l}^{-1}$

Answer 1

The correct option is B $Kkgmo{l}^{-1}$

From experimental observations :
$\Delta T_b=K_b\times m$
Here $m\text{is molality}$
$K_b$ is Boiling Point Elevation Constant or Molal Elevation Constant
It is also known as ebullioscopic constant.
$\text{S.I unit of Ebullioscopic constant}=\frac{\text{SI unit of}\Delta T_b}{\text{SI unit of molality}}=\frac{K}{molk{g}^{-1}}\text{S.I unit of Ebullioscopic constant}=Kkgmo{l}^{-1}$.