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CHEM AND BIO HELP AND TIPS HERE

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igext:

--- Quote from: MasterMath on June 06, 2010, 05:20:31 pm ---haber : 450C and 200 atm .. iron as catalyst ( Finely divided)
Contact: 450C 2 atm.. Vanadium (V) oxide
Cracking : Al2O3/SiO2 500C and 10-12atm
for adding H2O to ethene Phosphoric acid 300C 70 atm
For adding H2 to ethene Ni 200C
Correct me if im wrong!

--- End quote ---
are you quite sure thats all what we need to know?

8T:

--- Quote from: ~VIN1094~ on June 06, 2010, 05:22:42 pm ---It;s been solved earlier, i need to look..

--- End quote ---
Thanks ill be waiting for ur explanation !

Dana:

--- Quote from: 8T on June 06, 2010, 04:59:50 pm ---Could someone please explain may june 09 paper 32 q 5 b
I know it's for instance K3PO4 or T3 PO4.. but the other 2 marks not quite so any help??

--- End quote ---
its T3(PO4)2 Since 8 cm3 of Na3PO4 react fully with 12 cm3 of nitrate of T. This means the molar ratio is 12:8 or 3:2

Ghost Of Highbury:

"the vol. of phosphate soln used in cm3 is half the height of the ppt in mm
also at 8cm3 all the soln is used up. tht is because adding more does not increase the height of the ppt meaning there was no further reaction on adding more.
also the formula is T3(PO4)2-----because

u take it as 12cm3 of T nitrate react with 8cm3 of sodium phosphate (thts wen all the reactants r used up)
so.....12:8...simplify it
12:8
6:4
3:2
and therefore u get T3(PO4)2"

courtesy : mohit

MasterMath:

--- Quote from: igext on June 06, 2010, 05:23:39 pm ---are you quite sure thats all what we need to know?

--- End quote ---
Yes .. if there are more ill post .. thats what came up to my mind at za moment :D

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