Fallacy of composition

The fallacy of composition consists of arguing that if a set is composed of parts that have a certain attribute or property, the set will have the same attribute or property. -

example:

Hydrogen and oxygen are gases at room temperature

Water is composed of oxygen and hydrogen Therefore water is a gas at room temperature

example:

individuals have rights and obligations

a group is made up of individuals therefore the group (as a group) has rights and obligations