Drawing and naming the alcohols
2 marks · EasyButan-1-ol has the molecular formula C4H10O.
Calculate the number of hydrogen atoms needed to form two molecules of butan-1-ol.
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.
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20
Must show: C4H10O means 10 hydrogens, 10 × 2 = 20 hydrogens
Common mistakes: just 10 given
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Marking points
M1 · 1 mark · Recognises one molecule has 10 hydrogen atoms or gives partial working.
A1 · 1 mark · Correct answer: 20 hydrogens for two molecules.
Worked solution
One molecule of butan-1-ol: C4H10O, so 10 hydrogens.
Therefore, two molecules contain 20 hydrogen atoms.