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CHEMISTRY DOUBT!!!

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cashem'up:
10 At a total pressure of 1.0 atm, dinitrogen tetraoxide is 50 % dissociated at a temperature of 60
oC,
according to the following equation.
N2O4 2NO2
What is the value of the equilibrium constant, Kp, for this reaction at 60
oC?
A 1/3 atm B 2/3 atm C 4/3 atm D 2 atm

then answer is C but i am gettin D please explain

CHEMMASTER6000:
oh yea i got stuck on this one too, so since its 50% i put 100 as the initial values

                    N2O4     =    2N02
INITIANL        100               0
EQUI              50               100

mol fractoin     50/150         100/150
                    = 1/3              2/3

then kp= (2/3) squared / (1/3) = 4/3 ;D         

cashem'up:

--- Quote from: CHEMMASTER6000 on June 09, 2010, 02:23:42 pm ---oh yea i got stuck on this one too, so since its 50% i put 100 as the initial values

                    N2O4     =    2N02
INITIANL        100               0
EQUI              50               100

mol fractoin     50/150         100/150
                    = 1/3              2/3

then kp= (2/3) squared / (1/3) = 4/3 ;D         

--- End quote ---

ofcourse i forgot to square stupid!!! Thanks man  ;)

cashem'up:
Why is the addition of concentrated sulphuric acid to solid potassium iodide unsuitable for the
preparation of hydrogen iodide?
1 Hydrogen iodide is not displaced by sulphuric acid.
2 Iodide ions are oxidised to iodine.
3 The product is contaminated by sulphur compounds.

hey guys in this question the ans is D only 1 but shouldnt it be C as 2 and 3 should be correct rite  ??? ???
And  another q
Which chlorine compound has bonding that can be described as ionic with some covalent
character?
A NaCl B MgCl2 C AlCl3 D SiCl4

the Ans is B but isnt Alcl3 the better choice or is it because they said SOME covalent character

cashem'up:
hey sorry for the first one i looked at the wrong ms but 2nd is still a doubt and one more doubt

In an experiment, 50.0 cm3 of a 0.10 mol dm–3 solution of a metallic salt reacted exactly with
25.0 cm3 of 0.10 mol dm–3 aqueous sodium sulphite.
The half-equation for oxidation of sulphite ion is shown below.
SO ? 2
3 (aq) + H2O(I) ? SO2?
4 (aq) + 2H+(aq) + 2e–
If the original oxidation number of the metal in the salt was +3, what would be the new oxidation
number of the metal?
A +1 B +2 C +4 D +5

Can someone please help and solve especially the great chemmaster thanx  :-[

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