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# Moles Question watch

1. Pppl I do not know what has just happened there is this basic moles question which has just gone out of my mind!!!!!!

S + 02-----------> s02

what mass of S02 will be formed by reacting Oxygen with 64.2 (g) of S

S 02 S02
(32.1) + (32) -----------> (64.1) so multiply by 2

64.2 + 64 ----------- 128.2

shudnt that be the answer but I know Im missing out a step!!!!!!! This iis getting to me as I know its basic all the organic mechanisms revision has taken over!!!!
2. I got the same as you

It seems right to me lol. But i wouldn't trust my chemistry calculations lol!
3. lol thanx still for trying but Im sure Im missing a step.....as booklet sez 96.2 i have muddled around the numbers to get that but that still doesnt make any sense....bladdy annoyed now lol
4. I think you did it a different way, but our answers are close enough for me to think it's ok..

Here's how I did it..

Moles S = 64.2 / 32 = 2.00625

From equation, SO2 is 1:1, therefore moles SO2 =2.00625

Mass SO2 = 2.00625 * (32 + 16 + 16) = 128.4 g
5. yeh I think it is this but the answer booklet sez 96.2?????
6. Its actually really simple...you divide 64.2 by the Ar of sulphur to give the number of moles present. Since there is only the one atom of sulphur in SO2, this means that this will also be the number of moles of SO2 you produce.
Therefore, simply multiply the number of moles present by the Mr of SO2 and bingo - all yours.
But the answer you get is still right...thats just a simpler and easier to rationalise method you can use...
7. (Original post by Bond007)
yeh I think it is this but the answer booklet sez 96.2?????
96.2 g? Is the question asked exactly as you wrote it?
8. (Original post by Bond007)
lol thanx still for trying but Im sure Im missing a step.....as booklet sez 96.2 i have muddled around the numbers to get that but that still doesnt make any sense....bladdy annoyed now lol
i swear there must be a mistake in booklet cos i get 128.4g aswell

check that ur looking up the answer for the right qn cos usually i look up the answer for the rong qn and panic lol
9. yep....

first part just asked how many moles of o2 or s would be required to make 0.5 S02 then second Q asked this question..lol thats why I am confused..and very tired after organic revision
10. It's in the Letts book..AS...thanx ppl anyway for helpin' and to kinda calm me down cuz I was p***ed off as I was like how the hell can I not do some basic calculations!!!!!

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