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Question

Referring to the molecular sketch and table above, choose the option that best describes the percentage of carbon in the molecule, in terms of both atomic composition and mass-percent composition.
528697_c61819ee7b3a4be981d44575879baeef.png

A
Carbon makes up approximately 25% of the atoms, and 25% of the mass.
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B
Carbon makes up approximately 40% of the atoms, and 40% of the mass.
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C
Carbon makes up approximately 25% of the atoms, and 40% of the mass.
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D
Carbon makes up approximately 40% of the atoms, and 25% of the mass.
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Solution

The correct option is C Carbon makes up approximately 25% of the atoms, and 40% of the mass.
The molecular formula of compound =C4H9NO3
% of carbon atom =44+9+1+3=417×10025%

% of carbon by mass =4×1248+9+14+48=48119×100=40.33%

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