Name methane as the main constituent of natural gas

Organic Chemistry – Fuels

What is Natural Gas?

Natural gas is a fossil fuel that comes from deep underground. It’s mainly made up of a single molecule: methane (\$CH_4\$). Imagine a big bag of balloons – most of them are the same size and shape; that’s what natural gas looks like in the lab.

Composition of Natural Gas

ComponentFormulaTypical % (by volume)
Methane\$CH_4\$70–90 %
Ethane\$C2H6\$5–10 %
Propane & Butane\$C3H8\$, \$C4H{10}\$2–5 %
Other gases (CO₂, N₂, H₂S)Various<5 %

Why Methane Matters

Methane is the simplest hydrocarbon, consisting of one carbon atom bonded to four hydrogen atoms. Because of its small size, it’s very easy to transport and burns cleanly, producing only water and carbon dioxide. Think of it as the “starter kit” for many energy processes – it’s the first step in turning raw fossil fuel into electricity, heating, and even cooking gas.

Exam Tip: Naming Methane

  1. Remember the IUPAC rule: for alkanes, the suffix is -ane.

  2. Count the carbon atoms: one carbon → meth-.

  3. Combine: methane (\$CH_4\$).

  4. In exam questions, you’ll often see “main constituent” – that’s a hint that the answer is the most abundant component, i.e., methane.

Quick mnemonic: “Mighty Methane Makes Energy” – it’s the powerhouse of natural gas. 🚀