One hundred times mass of solute divided by mass of solution.

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Multiple Choice

One hundred times mass of solute divided by mass of solution.

Explanation:
Mass percent concentration expresses how much of the solution’s mass comes from the solute, as a percent. It is defined as (mass of solute / mass of solution) × 100. The given expression, 100 × (mass of solute) / (mass of solution), matches this definition exactly, so it represents mass percent concentration. Other concepts don’t fit because mole fraction uses moles, not mass; boiling point elevation is about how solute particles affect the boiling point (a colligative property) rather than a direct mass fraction; and normality is about equivalents per liter, not a mass ratio.

Mass percent concentration expresses how much of the solution’s mass comes from the solute, as a percent. It is defined as (mass of solute / mass of solution) × 100. The given expression, 100 × (mass of solute) / (mass of solution), matches this definition exactly, so it represents mass percent concentration. Other concepts don’t fit because mole fraction uses moles, not mass; boiling point elevation is about how solute particles affect the boiling point (a colligative property) rather than a direct mass fraction; and normality is about equivalents per liter, not a mass ratio.

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