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WJEC AS Chemistry CH1 May 22nd 2015

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Reply 140
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Ben_14
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Original post by Sh4hid96
N2O5


Thankyouuuuuu. Correct :biggrin:
Reply 141
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Ben_14
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Original post by Ben_14
Thankyouuuuuu. Correct :biggrin:


Also, whats was the enthalpy change for the one but last page? i think mine was around -36.6KJmol?
Reply 142
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Ben_14
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Original post by Ser_
I had -417!


I had the same.
Original post by Ben_14
Also, whats was the enthalpy change for the one but last page? i think mine was around -36.6KJmol?


56.something
Reply 144
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Ser_
6
Original post by Ben_14
Also, whats was the enthalpy change for the one but last page? i think mine was around -36.6KJmol?


Mine was -1.3KJmol-1 but I've just realised I put the concentration as 'n' instead of the moles!!!! Sugarrrrrr
Original post by Sh4hid96
I got 18.9.


I got this aswell, but rounded to 19%
Original post by Ben_14
Also, whats was the enthalpy change for the one but last page? i think mine was around -36.6KJmol?

I got this aswell
What did everyone put for the volume? I had like 0.228 something? And what was the catalyst?
Original post by ZeroShun
I also put delta H as equal to Ef -Eb.


I should be Eb - Ef
Reply 149
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Ben_14
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Original post by Ser_
Mine was -1.3KJmol-1 but I've just realised I put the concentration as 'n' instead of the moles!!!! Sugarrrrrr

should've been something along the lines of

-50x4.12x6.2/0.025 (pretty sure that was the moles value)
then divide by a 1000 to convert joules to KJ
Original post by Formless
I should be Eb - Ef


No it shouldnt
Original post by Ben_14
should've been something along the lines of

-50x4.12x6.2/0.025 (pretty sure that was the moles value)
then divide by a 1000 to convert joules to KJ


Don't you only use the number of moles of one of the reactants
Reply 152
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Ser_
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What did people put as the definition for molar mass?
Original post by Ser_
What did people put as the definition for molar mass?


Mass of one mole of a compound
Reply 154
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Ben_14
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Original post by Questioner1234
Don't you only use the number of moles of one of the reactants


well the entire equation had a 1:1:1:1 molar ratio so the moles would remain the same. I think it you had to work out the moles for NAOH which was 0.025. Make sense?
Original post by Questioner1234
No it shouldnt


Actually yeah my bad that is correct i forgot that deltaH is negative in exothermic, so Eb being larger. I guess i lost a mark then, however i know i did the graph right, just forgot about darn signs
Original post by Questioner1234
0.3something


Yes i got the same, Thought it was a bit too small, but i knew it had to be less than 2.4dm^3 as it was <0.1moles
Reply 157
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Ben_14
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Original post by Formless
Yes i got the same, Thought it was a bit too small, but i knew it had to be less than 2.4dm^3 as it was <0.1moles


What was the compound again? 2Ca(N03)2?
Original post by Ben_14
well the entire equation had a 1:1:1:1 molar ratio so the moles would remain the same. I think it you had to work out the moles for NAOH which was 0.025. Make sense?


Yeah I did the exact same method and got 56 with a temp change of 6.5 and volume of 25? What did you get as your answer.
Original post by Ben_14
What was the compound again? 2Ca(N03)2?


Yeah

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