At what temperature do NaNO3 and KNO3 have the same solubility?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

What is the lowest number energy level where a d sublevel is found