Final answer:
Hydrogen gas properties are classified as intensive if they do not depend on the amount of matter such as density, and extensive if they do depend on the amount like mass. Density is an example of an intensive property, while mass is an example of an extensive property.
Step-by-step explanation:
Properties of hydrogen gas can be classified as either intensive or extensive based on whether they depend on the amount of matter present. Extensive properties vary with the amount of matter, such as mass and volume. Conversely, intensive properties do not depend on the amount of matter and remain constant regardless of the sample size, such as boiling point or density.
For example, if you have two samples of hydrogen gas at the same pressure and temperature, their densities will be the same, making density an intensive property. However, the mass of these two samples will be different if they contain different amounts of hydrogen gas, making mass an extensive property. It's important to note that dividing one extensive property by another, for example mass by volume to get density, results in an intensive property.