The molecular formula for pentane is which of the following?

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Prepare for the IGCSE Organic Chemistry Exam. Study with flashcards and multiple choice questions, each question has hints and explanations to ensure you understand the core concepts. Get ready for your test with confidence!

Multiple Choice

The molecular formula for pentane is which of the following?

Explanation:
Alkanes have a simple pattern for their molecular formula: CnH2n+2. Pentane is an alkane with five carbon atoms, so substituting n = 5 gives H = 2(5) + 2 = 12, yielding C5H12. The other formulas correspond to hydrocarbons with fewer carbon atoms—CH4 is methane (1 carbon), C2H6 is ethane (2 carbons), and C3H8 is propane (3 carbons). Therefore, the pentane formula is C5H12.

Alkanes have a simple pattern for their molecular formula: CnH2n+2. Pentane is an alkane with five carbon atoms, so substituting n = 5 gives H = 2(5) + 2 = 12, yielding C5H12. The other formulas correspond to hydrocarbons with fewer carbon atoms—CH4 is methane (1 carbon), C2H6 is ethane (2 carbons), and C3H8 is propane (3 carbons). Therefore, the pentane formula is C5H12.

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