The molecular mass of as determined by osmotic pressure measurement is — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

$NaCl$ dissociates into Na^+ and Cl^- ions. Because of dissociation (i > 1), the observed colligative property is higher than theoretical. Since M_obs = M_normal / i and i > 1 for $NaCl$, the determined molecular mass will be less than 58.5.