20) Use stoichiometry to solve the following
complex problems:
A. If a
sample of K2S
is known to contain 8.418x1024 atoms of K, what mass of potassium sulfide is present?
8.418x1024 atoms K x
1 mol K
x 1 mol K2S x 110
mol K2S =
769 mol K2S
6.022x1023 atoms
K 2 mol K 1 mole K2S
B. How many chloride
atoms can be found in 38.0L of CCl4 gas at STP?
38.0 L CCl4 x 1
mol CCL4 x
4 mol Cl x 6.022x1023 atoms Cl
= 4.10 atoms CL
22.4 L CCl4
1 mol CCL4
1 mol Cl
C. If a
sample of carbon monoxide gas has a volume of 20.8L at STP, how many grams of
oxygen are present?
20.8L CO x 1
mol CO x 1 mol O x 16.0g
O = 14.9g O
22.4L CO 1 mol
C 1 mol O
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ReplyDeleteYour answer to part b is a a little wonky. The process that you used looks correct however, it looks like you forgot to put your answer in scientific notation correctly. It should be 4.10 X 10^24 rather than just 4.10. Otherwise your post looks great.
ReplyDeleteOn a, I think this was just a little mistake, but you solved for grams properly but you just wrote moles. Other than that great job!
ReplyDeleteGreat work Gabby!
ReplyDeleteI was a little confused with a, but then I read Will's comment, and when I looked back I do think you meant to put the molar mass instead of moles again.
On part b I got 4.09x10^24, I think you may have just forgotten the x10^24 part. Over all very nice work!