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The ration of the mass percentages of 'C & H' and 'C & O' of a saturated acyclic organic compound 'X' are 4 : 1 and 3 : 4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound 'X' is____.

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Ans. 5

Sol. Mass ratio of C : H is 4 : 1 $\implies$ 12 : 3

& C : O is 3 : 4 $\implies$ 12 : 16

so

massmolemole ratio
C1211
H333
O1611

Empirical formula $\implies$ CH3O

as compound is saturated acyclic so molecular formula is C2H6O2.

so required moles of O2 is 5

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How did you find the molecular formula ??

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