What term is defined as moles of solute per kilogram of solvent?

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Multiple Choice

What term is defined as moles of solute per kilogram of solvent?

Explanation:
Molality is defined as moles of solute per kilogram of solvent. It uses the solvent mass in the denominator, giving units of mol/kg, and it stays essentially constant with temperature because mass doesn’t change with heating or cooling, unlike volume. This makes it especially useful for studying colligative properties like boiling-point elevation and freezing-point depression. In contrast, molarity uses liters of solution (volume changes with temperature), normality relies on equivalents per liter, and mole fraction is a dimensionless ratio of moles of solute to total moles.

Molality is defined as moles of solute per kilogram of solvent. It uses the solvent mass in the denominator, giving units of mol/kg, and it stays essentially constant with temperature because mass doesn’t change with heating or cooling, unlike volume. This makes it especially useful for studying colligative properties like boiling-point elevation and freezing-point depression. In contrast, molarity uses liters of solution (volume changes with temperature), normality relies on equivalents per liter, and mole fraction is a dimensionless ratio of moles of solute to total moles.

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