Ammonia in its pure state is a single molecule (NH3) which, depending on pressure, can be either a liquid or a gas. Household ammonia (aqua ammonia) is a solution of ammonia in water which is usually...
The gas ammonia, NH3, is a pure substance. Sometimes a solution of NH3 in water is called ammonia too although it shold be called aqueous ammonia for clarity. In that case it is a mixture, and since...