How many moles of Cl– ions are in 2.20 L of 1.50 M of sodium-chloride aqueous solution?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.