Explanation:
This is a common quantitative procedure in chemistry used to determine the composition of atoms in a compound.
Given parameters:
Mass of acetic acid = 2.24mg
Mass of carbon dioxide = 6.22mg
Mass of water = 2.54mg
Unknown:
Mass percentage of carbon, hydrogen and oxygen = ?
Solution:
When a known mass of a compound is burnt completely in oxygen, we can determine the mass of each atom that constitutes it.
%Mass of carbon in compound = [tex]\frac{12}{44}[/tex] x [tex]\frac{x}{a}[/tex] 100
%Mass of hydrogen in compound = [tex]\frac{2}{18}[/tex] x [tex]\frac{y}{a}[/tex] 100
where x is the mass of carbon dioxide, y is the mass of water and a is the mass of compound:
%Mass of carbon in compound = [tex]\frac{12}{44}[/tex] x [tex]\frac{6.22}{2.24}[/tex] x 100 = 75.73%
%Mass of hydrogen in compound = [tex]\frac{2}{18}[/tex] x [tex]\frac{2.54}{2.24}[/tex] x 100 = 12.59%
To find the %mass of oxygen:
Total mass % = 100
%mass of oxygen = Total mass % - (%mass of carbon + %mass of hydrogen)
%mass of oxygen = 100 - (75.73 + 12.59) = 11.68%
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Mass percentage https://brainly.com/question/8170905
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