Chemical Formulae, Equations and Calculations Part 1
2 marks · HardThe molecular formula of a hydrocarbon is found to be C6H12. State its empirical formula.
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CH2
Also accept: CH2 (with correct formatting)
Common mistakes: C3H6; C6H12
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Marking points
M1 · 1 mark · Divides the subscripts of molecular formula by the highest common factor (6:12 → 1:2 for C:H).
A1 · 1 mark · Gives the correct empirical formula as CH2.
Worked solution
The highest common factor of 6 and 12 is 6. Divide both subscripts by 6:
Therefore, the empirical formula is CH2.