Structural isomerism in the alkanes
2 marks · EasyHow many carbon atoms are present in the alkane with the molecular formula C8H18?
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8 (±0)
Also accept: Eight; 8
Common mistakes: Confusing the subscript on hydrogen
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Marking points
M1 · 1 mark · Correctly identifies the number of carbon atoms as the subscript in C8
A1 · 1 mark · Answer: 8
Worked solution
C8H18 has 8 carbon atoms, as shown by the number after C in the formula.