Drawing and naming the carboxylic acids
2 marks · EasyHow many hydrogen atoms are present in one molecule of propanoic acid?
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6 (±0)
Must show: uses formula C3H6O2, identifies number of hydrogens
Common mistakes: using wrong formula; not counting all hydrogens
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Marking points
M1 · 1 mark · Identifies or uses the formula for propanoic acid (C3H6O2).
A1 · 1 mark · Correct answer: 6 hydrogen atoms.
Worked solution
Propanoic acid's formula is C3H6O2. There are 6 hydrogens.