Organic Compounds in Space The following compounds have been...

Organic Compounds in Space The following compounds have been detected in space. Which contains the greatest percentage of carbon by mass? a. naphthalene, $\mathrm{C}_{10} \mathrm{H}_{8}$ b. chrysene, $\mathrm{C}_{18} \mathrm{H}_{12}$ c. pentacene, $\mathrm{C}_{22} \mathrm{H}_{14}$ d. pyrene, $C_{16} H_{10}$

Organic Compounds in Space The following compounds have been detected in space. Which contains the greatest percentage of carbon by mass?
a. naphthalene, $\mathrm{C}_{10} \mathrm{H}_{8}$
b. chrysene, $\mathrm{C}_{18} \mathrm{H}_{12}$
c. pentacene, $\mathrm{C}_{22} \mathrm{H}_{14}$
d. pyrene, $C_{16} H_{10}$

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Key Concepts

Organic Compounds in Astrochemistry

Organic compounds in space, particularly those composed of carbon and hydrogen, play a significant role in astrochemistry. These compounds, which include polycyclic aromatic hydrocarbons (PAHs), are studied to understand the chemical processes and evolution in interstellar environments, highlighting the importance of elemental composition analysis in cosmic chemistry.

Molecular Formula and Stoichiometry

A molecular formula provides the number of atoms of each element in a compound and is fundamental to stoichiometry—the branch of chemistry that deals with the quantitative relationships between reactants and products. Understanding how to interpret a molecular formula allows one to calculate the overall molar mass, which is a key step in determining the percentage composition of each element.

Percent Composition

Percent composition is a measurement that expresses the mass percentage of each element in a compound. It is calculated by dividing the mass contribution of the element (from its atomic mass multiplied by the number of atoms in the molecule) by the total molar mass of the compound, and then multiplying by 100. This concept is essential for determining the relative amounts of elements within a molecule.

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