Petroleum products (LPG composition): What are the main constituent gases of Liquefied Petroleum Gas used for cooking and heating? LPG is a mixture of low–molecular-weight hydrocarbons stored as a liquid under moderate pressure. Choose the correct principal composition.

Given data

• LPG = Liquefied Petroleum Gas used domestically and industrially.
• Stored under pressure; vaporized for burning.

Concept/Approach
LPG is formulated primarily from propane and butane (including isobutane). Methane is the main component of CNG/LNG, not LPG.

Reasoning
• Propane and butane liquefy at modest pressures and ambient temperatures → ideal for cylinders.• Heavier components like hexane/nonane are not used due to poor volatility.

Common pitfalls
Mistaking LPG (propane–butane) for CNG/LNG (methane).

Final Answer
Propane (C3H8) and butane (C4H10)