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 :