Ebullioscopic constant

The Ebullioscopic constant calculator computes the Ebullioscopic constant based on the ideal gas constant R, the boiling point of the liquid, the molar enthalpy of vaporization and the molar mass.

INSTRUCTIONS: Choose units and enter the following:

• (T_b) This is the boiling point of a liquid
• (?H_vap)  This is the molar enthalpy of vaporization
• (M) This is the Molar mass of solvent

Ebullioscopic constant (K_b): The calculator returns the constant in K * kg/mol. 

The Math / Science

The Ebullioscopic constant allows one to relate molality to boiling point elevation. The formula for the Ebullioscopic constant is:

`K_b=(R·T_b^2·M)/(?H_"vap")`,

where: 

• K_b = Ebullioscopic constant
• R = ideal gas constant (R)
• Tb = boiling point of a liquid
• ?Hvap = molar enthalpy of vaporization
• M = Molar mass of solvent

References

Wikipedia (https://en.wikipedia.org/wiki/Ebullioscopic_constant)