Alkanes
3 marks · EasyThe following questions are about the alkanes.
State the general formula of alkanes.
What does the letter 'n' represent in the general formula ?
Using the general formula, give the molecular formula for an alkane with 7 carbon atoms.
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(a)
(b) The number of carbon atoms in the molecule
(c)
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Marking points
B1 (a) · 1 mark · States the general formula as .
B1 (b) · 1 mark · Correctly identifies 'n' as the number of carbon atoms in an alkane molecule.
B1 (c) · 1 mark · Gives the molecular formula (for n=7).
Worked solution
a. The general formula for alkanes is .
b. In this formula, 'n' is the number of carbon atoms in the alkane molecule.
c. For n = 7: