Astudent is given a sample of a calcium sulfate hydrate. he places the sample in a dry, covered crucible and weighs it. the total mass (crucible, cover, and hydrate) is 18.89918.899 g. the crucible and cover together had previously weighed 17.65517.655 g. he then heats the crucible to redness for 10 minutes with the cover slightly ajar. after the crucible cools, he weighs the crucible and its contents; the mass is now 18.63918.639 g, due to the loss of water of hydration. what is the mass of the original sample? mass of original sample : g what is the mass of the anhydrous (dehydrated) sample? mass of anhydrous sample : g what is the mass of the water that is driven off? mass of water driven off :

Compare and contrast physical changes with chemical changes.

How do cfcs cause ozone depletion? how do cfcs cause ozone depletion? ultraviolet radiation breaks down cfcs, molecules containing chlorine. chlorine then breaks one oxygen atom away from ozone, leaving behind a paired oxygen molecule. ultraviolet radiation breaks down cfcs, molecules containing chlorine. chlorine then breaks two oxygen atoms away from ozone, leaving behind a paired oxygen molecule. ultraviolet radiation creates cfcs, molecules containing chlorine. chlorine then breaks two oxygen atoms away from ozone, leaving behind a paired oxygen molecule. ultraviolet radiation creates cfcs, molecules containing chlorine. chlorine then breaks one oxygen atom away from ozone, leaving behind a paired oxygen molecule.

How many formula units in 2.63 mols of nacl?