Types of formula for organic molecules
2 marks · NormalState the molecular formula and the displayed 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) C2H6
(b) Displayed formula is: H–C–C–H, each C bonded to 3 H atoms (full displayed structure).
Common mistakes: Giving empirical instead of molecular formula; Incorrect number of hydrogens
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States the correct molecular formula: C2H6.
B2 · 1 mark · Draws or describes the correct displayed formula: two carbons bonded together, each carbon bonded to three hydrogens.
Worked solution
a) The molecular formula for ethane is C2H6.
b) The displayed formula is: