Question

which of the following substances can have variable composition? view available hint(s) graphite diamond air water

Explanation:

Graphite is an element (carbon in a particular form), diamond is also an element (carbon in a different form), and water (\(H_2O\)) is a compound. Elements and compounds have fixed compositions. Air is a mixture of gases like \(N_2\), \(O_2\), \(CO_2\), etc. Mixtures can have variable compositions as the amounts of the components can change.

Answer:

air