En el aire, el oxígeno representa el 21%en volumen. Una disolución concentrada comercial de ácido clorhídrico, HCl, tiene una concentración de l35% en masa.
Una disolución diluida de hidróxido de sodio, presente en un laboratorio, puede tener una concentración de 2M (molar).

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.