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    How the hell did I get 16% for percentage yield... Fml
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    (Original post by danni1998)
    i got a big number like 1065000 too but my Percentage yield was something like 23% since i thought you couldn't use moles to calculate H2S04's mass since it was aqueous?
    Everyone seems to be getting different answers for the yield one 😭
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    (Original post by Danny786)
    I didn't bracket it though. For the volume question did you get 0.451m3 by any chance?


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    I got 0.311 I think
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    (Original post by TJ_gym)
    was the SF4 square planar
    i drew it with 4 bonds with F and then a lone pair but what did everyone write for the bond angle value?
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    (Original post by Danny786)
    Was it copper or calcium?!?


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    Ye my bad copper
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    I thought the paper was OK, some new types of questions and I found myself quite pressed for time in comparison to other past papers.
    I identified sulfur twice for periodicity and silicon for the last one.
    Last page calculations I got 0.155m^3, 1070000g, 49.3%
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    Mass = moles*Mr
    Mass = 3750*284
    = 1,065,000g

    Percentage yield= 49.3%

    V=(nRT)/P
    = (1.77*8.31*(500+273))101,000
    =0.133m^3
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    I got 26.4 or something for % yield :/
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    You guys for the volume used v = nrt/p
    It was 2:1 ratio so x2 then temp was 773K and pressure 101 000
    Where did I go wrong?


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    What did everyobe write for the similarities and differences question. I put that the isoptopes abundance is the same as a similarity but 2+ions are produced as a difference. No idea if thats right
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    (Original post by Danny786)
    Sf4 bond angle 107???
    Sf6 90 and octahedral?


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    I did that
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    (Original post by Hello123Anonym)
    Mass = moles*Mr
    Mass = 3750*284
    = 1,065,000g

    Percentage yield= 49.3%

    V=(nRT)/P
    = (1.77*8.31*(500+273))101,000
    =0.133m^3
    yee
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    I got

    Chromatography for the seperation question but a lot of people said fractional distillation.

    Cu3H2C2O8

    0.451g
    1065000 for the mass
    49.3% (this is deffo right)
    And first method because 4 miles of phosphoric acid is produced instead of 2 and also, no second product is produced in the first method. However, you can also say second method because it's a one step reaction.
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    What did you guys put for the one about methanol and methanoil
    It was to do with Hydrogen bonding ok sure


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    will grade boundaries be high?
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    (Original post by Bloom77)
    I got

    Chromatography for the seperation question but a lot of people said fractional distillation.

    Cu3H2C2O8

    0.451g
    1065000 for the mass
    49.3% (this is deffo right)
    And first method because 4 miles of phosphoric acid is produced instead of 2 and also, no second product is produced in the first method. However, you can also say second method because it's a one step reaction.
    I said put both in water since methanol would dissolve as it forms H bonds with water whereas the other one (Methanethiol) or something would be insoluble?
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    (Original post by Bloom77)
    I got

    Chromatography for the seperation question but a lot of people said fractional distillation.

    Cu3H2C2O8

    0.451g
    1065000 for the mass
    49.3% (this is deffo right)
    And first method because 4 miles of phosphoric acid is produced instead of 2 and also, no second product is produced in the first method. However, you can also say second method because it's a one step reaction.
    Do you mean 0.451m3 or grams


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    (Original post by Danny786)
    What did you guys put for the one about methanol and methanoil
    It was to do with Hydrogen bonding ok sure


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    the alcohol was soluble in water (due to H bonding) so, add water and filter?
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    Some really nice parts in the paper and there were some nasty parts
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    (Original post by sr111)
    yee
    Shouldn't u divide that answer by 6? Coz there are 5 oxygen moles (g). There is also 1 gaseous moles of phosphoric acid. 1+5 gives 6. 0.133 divided by 6 and then multiplied by 1 gives the final answer
 
 
 
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