- A mixture of hydrogen and oxygen contains both hydrogen and oxygen molecules.

- The composition of the mixture is determined by the relative amounts of hydrogen and oxygen present.

- The mixture may contain any ratio of hydrogen to oxygen, and the composition can be changed by adding or removing either gas.

- The mixture is not chemically bonded, and the hydrogen and oxygen molecules can move independently of each other.

Composition of a compound containing oxygen:

- A compound containing oxygen contains oxygen atoms that are chemically bonded to other atoms.

- The composition of the compound is fixed and cannot be changed without breaking the chemical bonds.

- The oxygen atoms in the compound are not free to move independently, as they are held in place by the chemical bonds.

Key differences:

- A mixture of hydrogen and oxygen is a physical combination of two gases, while a compound containing oxygen is a chemical combination of oxygen atoms with other atoms.

- The composition of a mixture of hydrogen and oxygen can be changed by adding or removing either gas, while the composition of a compound containing oxygen is fixed.

- The hydrogen and oxygen molecules in a mixture can move independently of each other, while the oxygen atoms in a compound are held in place by chemical bonds.