1. The alkanes form an homologous series of compounds - Edexcel - GCSE Chemistry - Question 1 - 2017 - Paper 1
Question 1
1. The alkanes form an homologous series of compounds.
Molecules of alkanes contain carbon and hydrogen only.
(a) Which of these alkanes contains three carbon atom... show full transcript
Worked Solution & Example Answer:1. The alkanes form an homologous series of compounds - Edexcel - GCSE Chemistry - Question 1 - 2017 - Paper 1
Step 1
Which of these alkanes contains three carbon atoms?
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Answer
To determine which alkane contains three carbon atoms, we can analyze each option:
Butane (C₄H₁₀): Contains four carbon atoms.
Ethane (C₂H₆): Contains two carbon atoms.
Methane (C₁H₄): Contains one carbon atom.
Propane (C₃H₈): Contains three carbon atoms.
Thus, the correct answer is D propane.
Step 2
What is the formula of a molecule of pentane?
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Answer
The general formula for an alkane is given as C_nH_{2n + 2}. For pentane, which has five carbon atoms (n = 5), we can substitute n into the formula:
CnH2n+2ightarrowC5H2(5)+2ightarrowC5H12
Therefore, the formula of a molecule of pentane is A C₅H₁₂.
