Periodic Table Worksheet Page 4
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47. A 3.00 mg of aspirin was analyzed by combustion. Aspirin is known to contain 3 elements:
carbon, hydrogen, and oxygen (formula: C
H
O
). The results of the combustion analysis found
x
y
z
6.60 mg of CO
and 1.20 mg of H
O.
2
2
a. Using the concept of stoichiometry and conversions, calculate the mg of C in 6.60 mg of
CO
2
b. Using the concept of stoichiometry and conversions, calculate the mg of H in the 1.20 mg
of H
O
2
c. Now calculate the mg of O using the grams of C, H and the given total mass of aspirin
d. Using the mg of each element, convert the mg into moles and determine the empirical
formula.
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