How does the concentration of specific ions affect the properties of a solution?

What is the mass of 8 moles of sodium atoms

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

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.