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Using Ca = 40, C = 12 and O = 16, what is the formula mass of calcium carbonate, CaCO3?
A84 u
B100 u
C116 u
D68 u
Answer & Solution
Correct answer: B. 100 u
The formula unit has one Ca, one C and three O, so 40 + 12 + 3(16) = 100 u.
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