AQA AS Chemistry unit 1 resit May 27th 2016
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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 😭
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
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?
Original post by Danny786
Ye my bad copper
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
Mass = 3750*284
= 1,065,000g
Percentage yield= 49.3%
V=(nRT)/P
= (1.77*8.31*(500+273))101,000
=0.133m^3
(edited 7 years ago)
I got 26.4 or something for % yield :/
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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It was 2:1 ratio so x2 then temp was 773K and pressure 101 000
Where did I go wrong?
Posted from TSR Mobile
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 
Original post by Danny786
I did that
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
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
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.
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.
What did you guys put for the one about methanol and methanoil
It was to do with Hydrogen bonding ok sure
Posted from TSR Mobile
It was to do with Hydrogen bonding ok sure
Posted from TSR Mobile
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.
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?
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.
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
Posted from TSR Mobile
It was to do with Hydrogen bonding ok sure
Posted from TSR Mobile
the alcohol was soluble in water (due to H bonding) so, add water and filter?
(edited 7 years ago)
Some really nice parts in the paper and there were some nasty parts
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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