Types of formula for organic molecules
3 marks · Easy(a)[1 mark]
State the empirical formula of ethene.
(b)[1 mark]
Write the molecular formula of ethene.
(c)[1 mark]
Draw the displayed formula of ethene.
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Show answer
(a) CH2
(b) C2H4
(c) — · must show C=C double bond, each C with 2 H atoms
Show mark scheme and worked solution
Marking points
S1 (a) · 1 mark · 1 mark for correct empirical formula: CH2
S2 (b) · 1 mark · 1 mark for correct molecular formula: C2H4
S3 (c) · 1 mark · 1 mark for displaying a C=C double bond and the correct number of H atoms
Worked solution
a) Empirical formula: CH2
b) Molecular formula: C2H4
c) Displayed formula: H2C=CH2