this question is from edexcel chemistry unit 5 june ial(mcq)

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riamu
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17 Complete combustion of a hydrocarbon produced 1.76g of carbon dioxide and
0.720g of water.
The molecular formula of a hydrocarbon which is consistent with these data is
A C2H6.
B C3H8.
C C4H8.
D C6H6
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riamu
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17 A compound gives an orange precipitate with 2,4-dinitrophenylhydrazine, Brady’s
reagent, but does not react with ammonia in the cold.
The compound could be
A
CH2
H3C O
OH
CH
O
C CH3
B
H3C
O Cl
C
CH2
CH2
C
H3C
O O
C
CH2
C
OH
D
H3C
O O
C
CH2
C
Cl
(what's the deal of not reacting with ammonia in the cold?)
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charco
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(Original post by riamu)
17 Complete combustion of a hydrocarbon produced 1.76g of carbon dioxide and
0.720g of water.
The molecular formula of a hydrocarbon which is consistent with these data is
A C2H6.
B C3H8.
C C4H8.
D C6H6
All of the carbon in the carbon dioxide came from the hydrocarbon
All of the hydrogen in the water came from the hydrocarbon
Can you see how to proceed?
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maher17
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(Original post by charco)
All of the carbon in the carbon dioxide came from the hydrocarbon
All of the hydrogen in the water came from the hydrocarbon
Can you see how to proceed?
does the number of moles have to do anything with it? Cuz i can use some further help
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riamu
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(Original post by maher17)
does the number of moles have to do anything with it? Cuz i can use some further help
well.that is what we have to find to get to the final answer(molecular formula)
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riamu
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(Original post by riamu)
well.that is what we have to find to get to the final answer(molecular formula)
if you are able to do it then share your method of calculation
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