Use the definition of molarity to calculate the concentration of 12.34 g of CaSO4 completely dissolved in water, with a solution volume of 250.0 mL as measured using a volumetric flask. The molar mass of CaSO4 is 136.13 g/mol. Answer with 4 significant digits and include an appropriate unit.

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.