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    (Original post by ManOfJustTin)
    Did anyone else pick sulphur for X?
    I'm such an idiot 😂😂😭

    Still such an easy paper I'm so happy
    I did, then changed it last minute

    (Original post by emsieMC)
    I think it was h2so4, that's what I put
    I put that too. Pretty sure thats whats written in the book

    (Original post by thehollowcrown)
    Does the pressure have an effect on the emf? I said the emf increases eqbrm shift blah blah, but wasn't sure on that
    Yeah I said it increased emf because position of eq shifts to side with less mols favoring reduction.


    Know I mucked up on the calc question, I couldn't do it and I thought it was 5 marks but then my friend was like lol no so I've lost alot there Can't remember what I put for the solubility question, I know I wrote about equilibria but I'm scared I wrote solubility increases :/

    And the born haber wtf....May have messed up on that too. Was it always 2K or what? Because thats what I ended up putting and for the calc for the cycle did everyone multiply the atomisation and ionisation energy of K by 2?

    All in all, much better than unit 4.
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    I picked sulfur . Phosphorus or sulfur was fine
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    i got 2328 for born harbour cycle, 90 x 2 for atomisation of k and the 418 X2 for 2 ionisation energies for K
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    Nice easy paper. But I have made so many silly mistakes I just can't see myself doing very well. It's extremely itritating
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    (Original post by thehollowcrown)
    50 degrees C
    Needed converting to kelvin so 323
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    (Original post by JammyW15)
    I got the same as you originally but when I went back, I forgot to multiply the ionisation Enthalpy by 2 and that's how I got 2000 something so I'm sure you didn't multiply it by 2
    What? why did you multiply the ionisation enthalpy by 2? It was only the first ionisation energy?
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    (Original post by Abbie122)
    You couldn't put sulphur is specifically said sodium to phosphorus only
    Crap

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    (Original post by jenmturner)
    I did!! You are not alone but it was only like 2 marks so don't worry about it if I were you!
    same hahaha, wish they'd just make it clear - 'give the name of an element other than sulphur that...' so annoying
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    I thought the one with delta g said for this reaction rather than for the production of 1 mole of SO3
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    You reckon 80/100 wud be an a???
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    (Original post by 09ekennedy)
    -135.0 KJ mol-1
    I don't think this is right, answer should be half of this I believe due to the mole ratio given in the equation.
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    H -196 kJ mol-1
    S -189 K J mol-1
    G -135 kJ mol-1

    Btw what is the sign from answer -189 K J mol-1 indicates about the product relative to the reactants?
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    I put P then changed to S WOW 😓😓


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    Nooooooooo I made too many silly mistakes. But all in all I think I definitely made up for chem 4


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    (Original post by jenmturner)
    I did!! You are not alone but it was only like 2 marks so don't worry about it if I were you!
    Answer could have been sulfur Or phosphorus as they are both in period 3 and acidic
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    (Original post by justinamarina)
    I picked sulfur . Phosphorus or sulfur was fine
    Question said for Na-P, S comes after P.

    (Original post by thomaarrss)
    i got 2328 for born harbour cycle, 90 x 2 for atomisation of k and the 418 X2 for 2 ionisation energies for K
    Yup
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    (Original post by Number Nine)
    I got 94.4% purity and ticked hno3 kms
    same
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    what did every one get for the percentage purity- i think i got 49.3 or something like that
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    (Original post by amphoterism)
    H -196 kJ mol-1
    S -189 K J mol-1
    G -135 kJ mol-1

    Btw what is the sign from answer -189 K J mol-1 indicates about the product relative to the reactants?
    Half these because standard enthalpy means for one mole I believe (had to do it in a previous paper)

    Product is less disordered than reactants/product is more ordered than reactants
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    doesnt the solubility increase? or does it decrease?..
 
 
 
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