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chemistry urgent help needed!!!

hady

hady

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never mind guys i got it if cant answer it i will gladly help
 
IGCSE O/L student

IGCSE O/L student

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a)i) to make sure all the hydrocarbon is burned
ii)CO2 is acidic in nature
iii)20cm^3
90cm^3
60cm^3
iv)no. of moles of hydrocarbon used is 0.02/24=0.0008333333333
no. of moles of O2 used is 0.09/24=0.00375
no. of moles of Co2 used is 0.06/24=0.0025
if 1 mole of hydrocarbon was used:
1CxHy+4.5O2------>3CO2+ 3H2O
so x=3, y=6
b)i) sorry but I can't draw it and show you.
ii)light
iii)Cracking is a process in which large hydrocarbons are broken down into smaller, more useful hydrocarbons at high temperatures using a catalyst. Ex: Petroleum----->alkane+alkene. the alkenes produced can be used to make alcohols.
 
hady

hady

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IGCSE O/L student said:
a)i) to make sure all the hydrocarbon is burned
ii)CO2 is acidic in nature
iii)20cm^3
90cm^3
60cm^3
iv)no. of moles of hydrocarbon used is 0.02/24=0.0008333333333
no. of moles of O2 used is 0.09/24=0.00375
no. of moles of Co2 used is 0.06/24=0.0025
if 1 mole of hydrocarbon was used:
1CxHy+4.5O2------>3CO2+ 3H2O
so x=3, y=6
b)i) sorry but I can't draw it and show you.
ii)light
iii)Cracking is a process in which large hydrocarbons are broken down into smaller, more useful hydrocarbons at high temperatures using a catalyst. Ex: Petroleum----->alkane+alkene. the alkenes produced can be used to make alcohols.
Click to expand...
thnx but for (iv) u didnt need to do all these steps ..they are all gasses so the ratio is direct without converting to moles as for X and Y look at the number of carbon on the right ..according to the ratio its 3...as for H2O use the number of oxygen ..there are 9 on the left (4.5*2=9) so the right side must have 9 oxygen atomes too thus ratio of water is 3 :D
 
hady

hady

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if you dont understand how i solved it stick with your method it's frustrating to change your way of solving problems right before the exam
 
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