Which property is defined as the amount of mass per unit volume of a substance?

• A. Solubility
• B. Density
• C. Viscosity
• D. Molarity

Answer: (B)

Verified step by step guidance

1. Understand that the problem is asking for a property that relates mass and volume of a substance.
2. Recall the definitions of the given options: Solubility is the ability of a substance to dissolve in a solvent; Viscosity is a measure of a fluid's resistance to flow; Molarity is the concentration of a solution expressed as moles of solute per liter of solution.
3. Identify that Density is defined as the amount of mass per unit volume of a substance.
4. Express the formula for density as \(\text{Density} = \frac{\text{Mass}}{\text{Volume}}\).
5. Conclude that the property defined as mass per unit volume is Density.