QQuestionChemistry
QuestionChemistry
The empirical formula of the compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass is _____.
A. C₆H₁₂O₆
B. C₃H₆O₃
C. C₂H₇O₃
D. CHO
E. CH₂O
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Assume 100 g of the compound
- Oxygen: $$53.3 \text{ g}
First, we'll calculate the mass of each element in 100 g of the compound:
Step 3:: Convert masses to moles
- Oxygen: $$\frac{53.3 \text{ g}}{16.00 \text{ g/mol}} = 3.33 \text{ mol}
Calculate moles by dividing mass by atomic mass:
Step 4:: Find the mole ratio
- Oxygen: $$\frac{3.33}{3.33} = 1
Divide each mole value by the smallest number of moles:
Step 5:: Determine empirical formula
The empirical formula is $$\text{CH}_2\text{O}
Final Answer
CHO
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