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# 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.
2. (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.
3. (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?
4. (Original post by thefatone)
i see...... i don't understand question 1 part 4 how do i calculate the percentage yield?
5. (Original post by Kvothe the arcane)
How do i work out the theoretical yield?
6. (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.
7. (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?
8. (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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