Mass is a unique property of any property.

Physical Properties of matter are characteristics of a substance that can be observed or measured without changing the makeup of the matter of the substance (NO chemical change needs to occur-meaning their particles stay the same). Characteristics such as mass, volume, color and temperatures are physical properties.
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity. measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more. without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others. Key Points
Matter can exist in one of three main states: solid, liquid, or gas.
Solid matter is composed of tightly packed particles. ...
Liquid matter is made of more loosely packed particles. ...
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. the same whether the sample being observed is large or small. Examples of characteristic properties include freezing/melting point, boiling/condensing point, density, viscosity, and solubility.
Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

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