The Percent Composition by Mass of a Compound Is 76

question 80

Multiple Choice

The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound

• A) C₁₀H₆O
• B) C₉H₁₈O
• C) C₁₆H₂₈O₄
• D) C₂₀H₁₂O₂
• E) C₁₈H₃₆O₂

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Definitions:

Phrenic Nerve

A nerve that originates in the neck and passes down between the lung and heart to reach the diaphragm, crucial for breathing as it controls the diaphragm's movements.

Rectus Abdominus

A long muscle running from the pubis to the ribcage, involved in flexing the lumbar spine and stabilizing the pelvis and core.

Pectoralis Minor

A thin, triangular muscle located beneath the pectoralis major, involved in movements of the shoulder blade, including drawing it downward and forward.

Internal Intercostal

Muscles located between the ribs that contract during exhalation, aiding in the forced expiration of air from the lungs.