Chemistry 9701/P22

[ExoticPlayer09]

Hey, did you people gave 21, 22 or 23. Which paper had this K.C question (0.44 answr) and the rest.

 

[Islu_jf]

yo aiza anjum .. what came in question 1????

 

[histephenson007]

paper 22

And I got 2. *something* for Kc

 

[AizaAnjum]

something with kc i dont want to remember it though =p

 

[zahraahmed]

hey the last question of 22 which functional grp was present?
i wrote ETHER because the C--O--C functional grp is ether was this right.....................
i think the inorganic part was tough!!!

 

[histephenson007]

No, ...

right after the -O- group there was a >C=O group....so technically, it is an ester

 

[histephenson007]

btw...how many chiral centres did u guys get?

 

[AizaAnjum]

yeah it was ester and there were 2 centres
i got these two parts wrong thank God they were for a mark each... not more

 

[grumpy]

lets all pray k gt less than 50 ho.
cuz i am expecting 50-54

 

[AizaAnjum]

same here.... maximum 54 for me

 

[AizaAnjum]

paper1 aur paper 34 mein kitne marks ane chaiyen to get 90 above?

 

[AizaAnjum]

hey 48 out of 60 is an A grade. so gt should be less than this as A is now at 80

 

[grumpy]

i say k minimum 35/40 in p1 ho.
and about ppr 34 bacho ko kafi difficulties hoti hai to mera khayal se above 30 ho to inshallah A a jaye ga

 

[m2rulz143]

Guys the answer to kc was 0.429 or 0.43 coz after rxn with naoh 0.06 moles of acid will be left and then at the equillibrium half of it will react so 0.03 moles will be there at equillibrium and the table will be something like this
Acid: 0.03 alcohol: 0.07(coz 0.03 reacted to form ester and water) ester 0.03 ( 1:1 ratio) and water 0.03. For those of you sayin 0.06 mol acid at equillibrium this is not possible that ester is being formed without acid being used up. I hope im pretty clear on this..

 

[link318]

What is the Bond energy for C-F? and the alcohol, is it all 3 -OH react wit the acid?

 

[AizaAnjum]

bod energy was 4 hundred something and yeah all of them did because the question said completely esterified

 

[zahraahmed]

everyone pray gt is at 45 *sigh*
maximum 47 for me.......................

 

[AizaAnjum]

inshAllah the lower the better
are you done with practical?
would someone tell me a way to get over with p34 with marks 30 or above?

 

[obsessedgenius]

Guys the answer to kc was 0.429 or 0.43 coz after rxn with naoh 0.06 moles of acid will be left and then at the equillibrium half of it will react so 0.03 moles will be there at equillibrium and the table will be something like this
Acid: 0.03 alcohol: 0.07(coz 0.03 reacted to form ester and water) ester 0.03 ( 1:1 ratio) and water 0.03. For those of you sayin 0.06 mol acid at equillibrium this is not possible that ester is being formed without acid being used up. I hope im pretty clear on this..

Sorry dude. I already explained the reason.The value of Kc was 2.25 or smthng not 0.44....as NaOH was 0.045 moles and 0.005 reacted with HCl. 0.04 reacted with Ethanoic Acid, meaning that 0.04 moles of Ethanoic Acid were there at equilibrium. So Both the reactants were of 0.04 and products at 0.06 concentration. 8) ..it just didn't click at that time. I wrote the opposite and got 0.44

 

[AizaAnjum]

same =(