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Question

An organic compound contains 40% carbon and 6.66% hydrogen. Calculate the empirical formula 11.2l of the vapours of that substance weigh 30 g. What is the molecular formula of the compound ?

A
C4H8O4
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B
C3H4O2
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C
C2H4O
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D
C2H4O2
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Solution

The correct option is C C2H4O2
an organic compound contain 40% carbon ,6.66% hydrogen and 53.33% oxygen
mole of carbon = 4 mole
for carbon 40122= 3.33 3.333.33= 1 atom

for hydrogen 6.661= 6.66 6.663.33= 1 atom

for oxygen 53.3316= 3.33 3.333.33= 1 atom

emperical formula CH2O
mass 30 gram C is 60/30 = 2 atom
so formula is C2H4O2
answer is D

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