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An organic compound contains carbon, hydrogen and oxygen in the mass…
Question
An organic compound contains carbon, hydrogen and oxygen in the mass percentages 40.0% C, 6.67% H and 53.33% O (atomic masses C=12, H=1, O=16). Its molar mass is 180 g/mol. Determine the number of carbon atoms present in one molecule of the compound.
✓ Verified answer: 6checked by our engine — not a guess
Step-by-step solution
Take 100 g: moles C = 40.0/12 = 3.333; H = 6.67/1 = 6.67; O = 53.33/16 = 3.333.
Divide by smallest (3.333): C:H:O = 1:2:1 -> empirical formula CH2O, empirical mass = 30.
n = molar mass / empirical mass = 180/30 = 6 -> molecular formula C6H12O6.
Number of C atoms = 1 x 6 = 6.
Final answer6.0
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