Explanation:
Given parameters:
Mass of aspirin = 0.45g
Mass of C = 0.27g
Mass of H = 0.02g
Mass of O = 0.16g
Unknown:
Mass percentage of the constituents = ?
Solution:
To find the mass percent, ensure that sum of the mass of the elements add up to the that of the given mass of aspirin
Total mass = 0.27 + 0.02 + 0.16 = 0.45g
Now express each of the given percentages to that of the total one.
mass percent of C = [tex]\frac{0.27}{0.45}[/tex] x 100 = 60%
mass percent of H = [tex]\frac{0.02}{0.45}[/tex] x 100 = 4.4%
mass percent of O = [tex]\frac{0.16}{0.45}[/tex] x 100 = 36%
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