Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Based on the following structural formulas, calculate the percentage of carbon by mass present in each compound.

Problem

Based on the following structural formulas, calculate the percentage of carbon by mass present in each compound.

Benzaldehyde (almond fragrance) is a six-carbon (hexagon) ring, with double bonds in alternating sides. The first double bond is in the top. All of the Cs except the right point are single bonded out of the ring to H; the right point is single bonded to a C that is double bonded above to O and single bonded right to H.Vanillin (vanilla flavor) has the same structure as the molecule in part (a), except two additional carbons are single bonded to a group other than H. The C in the left point is single bonded left to OH, and the C in the upper left vertex is single bonded to OCH3.

Isopentyl acetate (banana flavor) is a four carbon chain with all Cs joined by single bonds. The left C is a CH3, the second C is a CH, and the third and fourth Cs are CH2s. The second C is also single bonded below to CH3, and the fourth C is single bonded right to an O that is single bonded right to C. That C is double bonded above to O and single bonded right to CH3.