A nonvolatile nonelectrolyte is a covalently bonded molecule that. It is often used when examining colligative properties because they have less of an impact on the colligative properties than electrolyte solutions.
Nonvolatile solutes depress the vapor pressure above the solution, which is only due to the solvent molecules. Volatile solutes that form miscible solutions are more complicated, as each substance has a vapor pressure, with the total vapor pressure being the sum of all the partial vapor pressures.
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