How many grams of MgCl2 would be needed to make 6.6 liters of a 0.78 molar solution? Round your answer to the nearest 0.01

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?