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Pls Help !! Chemistry paper 3 ???

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yeah their ig questions from past papers .. plz help ... i can prove dey r if u want
 
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Outofideaz said:
i need help plzz in the following two questions !!!
Give the marking scheme so that I can give you the answer :wink: :wink: :wink: :wink:
 
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smartygirl said:
:oops: SO GUYZ DO U RILLI THINK CHEM WILL B AS HARD AS PHY N BIO
I THINK SO
U mean varient 1, if varient 1 it will be damn easy in order to balance it but for varient 2 damn hard also to belance it
 
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For the first one:

d.i) 1 mole takes up 24dm^3, so 5 moles were formed.
ii) If 5 moles were formed, then using the second equation, (EDIT) As the question says that 1 mole was formed, y=2.
iii) I have no idea how to find x.


For the second one:

a) Energy Saved = 250 x 95/100 =237.5

This implies that 12.5 GJ is used to make 1 tonne of paper via recycling.. (I think so anyway :D)

These questions are pretty tough, so I'm just trying my best, I hope I somewhat helped and somewhat got it right.
 
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thanks ur answer is correct according to the marking scheme ... one question is frm 1993 and the other frm 1994
 
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Ahh, I think I know how to find x too. If 1 mole reacts to form 1 mole of CO2, then 3 + x = 5
=> x = 2.
 
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