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JEE Main20262 April 2026Morning ShiftChemistryHydrocarbonsActual

One mole of an alkane (x) requires 8 mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane (x) is _______.

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Step-by-step solution

The general formula of an alkane is C_n H_ 2n+2 . The balanced chemical equation for the complete combustion of an alkane is: C_n H_ 2n+2 + ( 3n+1 2 ) O₂ n CO₂ + (n+1) H₂O Given that 1 mole of the alkane requires 8 moles of oxygen for complete combustion, we equate the stoichiometric coefficient of O₂ to 8 : 3n+1 2 = 8 3n + 1 = 16 3n = 15 n = 5 The molecular formula of the alkane is C₅H₁₂ . The number of carbon atoms is 5 and the number of hydrogen atoms is 12 . Sum of the number of carbon and hydrogen atoms = 5 +

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