1) One of the hydrates of CoCl 2 is cobalt(II) chloride dihydrate. A 81.8 gram sample of...
Question:
1)
One of the hydrates of CoCl2is cobalt(II) chloride dihydrate. A 81.8 gram sample of CoCl2 2 H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
2)
A student is running an experiment in which 34.3 grams of KF is needed, but the only jar of reagent in the lab is labelled potassium fluoride dihydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?
3)
One of the hydrates of CoSO4is cobalt(II) sulfate hexahydrate. A 66.4 gram sample of CoSO4 6 H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
4)
What is the mass of a boron tribromide molecule ?
grams?
5)
What is the mass of a nitrogen dioxide molecule ?
grams?
6)
How many grams of S are present in 3.36 grams of disulfur decafluoride ?
grams S.
7)
How many grams of disulfur decafluoride contain 1.48 grams of F ?
grams disulfur decafluoride.
8)
How many grams of Ca2+ are present in 4.09 grams of calcium bromide?
grams Ca2+.
9)
How many grams of calcium bromide contain 3.87 grams of Ca2+?
grams calcium bromide.
10)
How many grams of Fe2+ are present in 1.16 grams of iron(II) cyanide?
grams Fe2+.
11)
How many grams of iron(II) cyanide contain 3.07 grams of Fe2+?
grams iron(II) cyanide.