Problem 41 - Introductory Chemistry Atoms First

Question

The smallest possible piece of the compound nonane, a component of gasoline, contains 9 carbon atoms and 20 hydrogen atoms. Write the chemical formula for nonane, with carbon first.

Step-by-Step Solution

Answer

The chemical formula for nonane is \( C_9H_{20} \).

Step 1: Identify Carbon atoms

Nonane has 9 carbon atoms.

Step 2: Identify Hydrogen atoms

Nonane has 20 hydrogen atoms.

Step 3: Write the chemical formula

Replace x and y in the general formula (CxHy) with the number of carbon and hydrogen atoms: For nonane, the chemical formula is C9H20.

Key Concepts

Nonane

Nonane is a fascinating organic compound that belongs to a group called alkanes. Alkanes are saturated hydrocarbons, which means their carbon atoms are connected by single bonds, making them stable. Nonane is often discussed in chemistry due to its relevance as a component of gasoline.
Its chemical structure includes a chain of nine carbon atoms, which is a defining feature of nonane. This chain is fully saturated with hydrogen atoms, ensuring each carbon forms four covalent bonds. Nonane is an important chemical in fuel because it helps provide energy when combusted. Always remember that nonane, like other alkanes, follows the general formula for linear alkanes, which is crucial as we explore its chemical formula.

Carbon Atoms

Understanding the role of carbon atoms is essential when studying organic compounds like nonane. Each carbon atom forms four covalent bonds that can connect with hydrogen atoms or other carbon atoms. This nature of carbon allows for an immense variety of organic structures.
In nonane, there are nine carbon atoms, arranged in a straight chain. This straight chain arrangement is called a linear or normal configuration.
The versatility of carbon atoms allows them to link together in various ways to form chains, rings, or complex networks, which is why carbon chemistry is complex yet exciting. Remember that for every organic formula, understanding how carbon atoms bond is crucial for determining the overall structure.

Hydrogen Atoms

Hydrogen atoms are the most abundant chemical elements in nonane, apart from carbon. They each form a single covalent bond due to having one electron in their outer shell.
In nonane, there are 20 hydrogen atoms, complementing the nine carbon atoms to complete the structure.
Hydrogen's role in hydrocarbons is mostly to fill the remaining valences in carbon atoms, ensuring that they have the full number of four covalent bonds. This complete bonding forms a stable, saturated molecule.
By understanding hydrogen's role in structure stability, you can better predict and comprehend the behavior of hydrocarbons like nonane.

Writing Chemical Formulas

Writing chemical formulas is a way we represent molecules and compounds succinctly. Each formula consists of the chemical symbols of the elements and subscripts denoting their quantity in the molecule.
For hydrocarbons like nonane, the general formula can be expressed as \( C_xH_y \). Here, 'x' and 'y' are replaced with the respective number of carbon and hydrogen atoms.
For nonane, we substitute 'x' with 9 and 'y' with 20 to get \( C_9H_{20} \).
This formula format is straightforward: list the carbon (C) first, followed by hydrogen (H). Understanding this notation is fundamental for recognizing and writing any chemical structure, especially in organic chemistry.