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    (Original post by bmpink)
    115 isn't bad! I need about 83% if I didn't go up in my F321 retake, but I genuinely have no idea how it went because it's so much easier than A2 I feel like I have nothing to gage it on! Good luck! If you need any more help ask me because I need the practice!!
    Ah I see, I know what you mean.. i resat F321 in January and went from 69/90 to 86/90 it is not even comparable to what we're going to face on Wednesday is it!
    Thank you I will :P
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    An unusual compound of iron has been detected on the surface of the planet Mars. This compound contains the ferrate(VI) ion.
    A student uses 1.00 g of iron(III) oxide and makes, on crystallisation, 0.450 g of sodium ferrate(VI), Na2FeO4.
    Calculate the percentage yield, by mass, of sodium ferrate(VI).



    how did they get the mass of Sodium ferrate as 2.08g ? thanks
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    anyone here got jan 13 ms
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    (Original post by needtosucceed=))
    no idea im afraid :/ in the specification it states only for monoprotic acids :/
    it seems like a reasonable thing to do if it does come up
    You got the first post of page 100
    Lucky.
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    (Original post by bmpink)
    115 isn't bad! I need about 83% if I didn't go up in my F321 retake, but I genuinely have no idea how it went because it's so much easier than A2 I feel like I have nothing to gage it on! Good luck! If you need any more help ask me because I need the practice!!
    bmpink, please could you help me with a question that I have posted on the previous page (I think or page before)?
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    (Original post by otrivine)
    An unusual compound of iron has been detected on the surface of the planet Mars. This compound contains the ferrate(VI) ion.
    A student uses 1.00 g of iron(III) oxide and makes, on crystallisation, 0.450 g of sodium ferrate(VI), Na2FeO4.
    Calculate the percentage yield, by mass, of sodium ferrate(VI).



    how did they get the mass of Sodium ferrate as 2.08g ? thanks
    Fe2O3 > 2NaFeO4

    so you find the moles of Fe2O3, multiply by 2 for the moles of NaFeO4 then multiply by Mr for the mass
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    (Original post by otrivine)
    they put 1 ?
    Yes that makes sense actually. 1 mole to 1 mole. Stoichiometry is equal.
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    (Original post by F Hopeful)
    Fe2O3 > 2NaFeO4

    so you find the moles of Fe2O3, multiply by 2 for the moles of NaFeO4 then multiply by Mr for the mass
    can you show me please
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    (Original post by _HabibaH_)
    Yes that makes sense actually. 1 mole to 1 mole. Stoichiometry is equal.
    is it because of the mole ratio
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    (Original post by otrivine)
    can you show me please
    you find the Mr of Fe in Fe2O3 which is 159.6

    n(Fe2O3) = mass/mr

    1/159.6= 0.006266 mol

    what I did then was set up an equation for the reaction so

    Fe2O3 + 4Na + 5H2O----> 2Na2FeO4 + 5H2

    the ratio of Fe2O3 to Na2FeO4 is 1:2 so moles of Na2FeO4 = 2x0.006266 = 0.012532

    mass of Na2FeO3= moles x mr = 0.012532x165.8= 2.08g

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    (Original post by otrivine)
    is it because of the mole ratio
    Yep. Is there anything you found hard cuz you know A LOT so anything you think is worth looking at, would help everyone I think.
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    (Original post by Namod)
    You got the first post of page 100
    Lucky.
    OMG really.
    i'm a don :')
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    Hey all just a small question, when drawing out complex ions in 3d form whats the best way to show it being a dative bond without it looking messy?
    because i see that they sometimes dont even draw arrows showing its dative?

    Cheers
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    (Original post by _HabibaH_)
    Yep. Is there anything you found hard cuz you know A LOT so anything you think is worth looking at, would help everyone I think.
    Sorry I just keep getting panicked when exam is getting closer
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    (Original post by otrivine)
    Sorry I just keep getting panicked when exam is getting closer
    Same lol. When I'm not panicking, i'm wasting time thinking of how much I'm panicking.
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    (Original post by Tidius)
    Hey all just a small question, when drawing out complex ions in 3d form whats the best way to show it being a dative bond without it looking messy?
    because i see that they sometimes dont even draw arrows showing its dative?

    Cheers
    You don't need to show it's dative, just make sure it's 3D structure is clear.


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    Quick question, do we have to cover Kp?
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    The cell represented below was set up under standard conditions.
    Pt|Fe2+(aq), Fe3+(aq)||Tl3+(aq),Tl+(aq)|Pt Cell e.m.f. = + 0.48 V
    (i) Deduce the standard electrode potential for the following half-reaction.
    Tl3+(aq) + 2e– → Tl+(aq)
    ................................ ................................ ................................ ...........................


    how?
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    Also when calculating entropy ^S and there are two moles of either a reactant or product as a pose to one, do we then times the number in the table by two, or not?
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    (Original post by InadequateJusticex)
    Resitting this paper, everything just went wrong in January
    Exactly happened with me in my other exams I got an A and B comes F325 i landed myself an E was gutted
 
 
 
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