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11.6 g of an organic compound having for...

11.6 g of an organic compound having formula `(C_(n)H_(2n+2))` is burnt in excess of `O_(2)(g)` initially taken in a 22.41 litre steel vessel. Reaction the gaseous mixture was at 273 K with pressure reading 2 atm. After complete complete combustion and loss of considerable amount of heat, the mixture of product and excess of `O_(2)` had a temperature of 546 K and 4.6 atm pressure. The formula of organic compound is :

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