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What is the molality of a nonvolatile, nonelectrolyte solute?
is equal to the moles of divided by the kg of .
Because it is a non-electrolyte the solute doesn't break up into ions so the number of moles dissolved in solution is equivalent to the number of moles of solute particles in solution.
For example, if 1 mole of NaCl (a strong electrolyte) were dissolved in solution the result would be two moles of solute particles (a mole of Na+ plus a mole Cl-). If a mole of sucrose (C12H22O11 - a nonelectrolyte) were dissolved however, it would result in one mole of solute particles because sucrose does not break down into smaller pieces.