Types of formula for organic molecules
3 marks · EasyThe table shows information about three organic compounds.
| Compound | Type of formula | Formula |
|---|---|---|
| ethane | molecular | C2H6 |
| propene | empirical | CH2 |
| butane | displayed |
State the type of formula shown for propene.
Complete the table: Give the displayed formula for butane.
Write the empirical formula for ethane.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) empirical
(b) — · must show Four C atoms in a chain, each with enough H to make four bonds per C
(c) CH3
Show mark scheme and worked solution
Marking points
D1 (a) · 1 mark · 1 mark for correct identification: empirical
D2 (b) · 1 mark · 1 mark for correct displayed formula of butane (linear chain; each C with 4 bonds to H or C)
D3 (c) · 1 mark · 1 mark for correct empirical formula: CH3
Worked solution
a) The type of formula shown for propene is 'empirical'.
b) The displayed formula for butane is:
with each carbon having enough hydrogens to make four bonds.
c) The empirical formula for ethane is CH3.