# Help chem specimen paper

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#1
http://filestore.aqa.org.uk/resource...-74042-SQP.PDF

Question 1 part 2

don't know what the thing will look like after it's been dehydrated using conc. sulfuric acid.
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#2
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4 years ago
#3
(Original post by thefatone)
http://filestore.aqa.org.uk/resource...-74042-SQP.PDF

Question 1 part 2

don't know what the thing will look like after it's been dehydrated using conc. sulfuric acid.
A carbon will lose a hydrogen and hydroxyl group and form a double bound with its neighbour.
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#4
(Original post by Kvothe the arcane)
A carbon will lose a hydrogen and hydroxyl group and form a double bound with its neighbour.
i see...... i don't understand question 1 part 4 how do i calculate the percentage yield?
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4 years ago
#5
(Original post by thefatone)
i see...... i don't understand question 1 part 4 how do i calculate the percentage yield?
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#6
(Original post by Kvothe the arcane)
How do i work out the theoretical yield?
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4 years ago
#7
(Original post by thefatone)
How do i work out the theoretical yield?
Work out the moles of reactant and moles of expected product using stoichiometric ratios. Use the mol/mass triangle to workout the mass of expected product in grams. This is the theoretical yield.
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#8
(Original post by Kvothe the arcane)
Work out the moles of reactant and moles of expected product using stoichiometric ratios. Use the mol/mass triangle to workout the mass of expected product in grams. This is the theoretical yield.
So do i have to translate that skeletal formula into number of atoms so i can find the relative mass of the compound?
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4 years ago
#9
(Original post by thefatone)
So do i have to translate that skeletal formula into number of atoms so i can find the relative mass of the compound?
Yup, there's Cs, Hs and Os to count.
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