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Give the combustion reaction of alkane. |
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Answer» Solution :(a) Controlled oxidation reaction od alkane : Alkanes on HEATING in the PRESENCE of air of dioxgen are completely oxidized to carbon dioxide and water with the evolution of large amount of heat. Reaction of combusiton of alkane is as follows : Alkane + oxygen `underset("combustion")overset("Complete")rarr` carbondioxide + water (i) `CH_(4(G)) + 2O_(2(g)) rarr CO_(2(g)) + 2H_(2)O_((l))` Methane`Delta_(C)H^(ɵ) = -890 Kj mol^(-1)` ...(i) (ii) `CH_(4)H_(10(g)) + (13)/(2)O_(2(g)) rarr 4CO_(2(g)) + 5H_(2)O_((l))` Butane `Delta_(C)H^(ɵ) = -2875.84 Kj mol^(-1)` ...(ii) (iii) In any alkane on. of carbon = n then normal combustion reaction formula is : `C_(n)H_(2n+2) + ((3n+1)/(2))O_(2) rarr nCO_(2) + (n+1)H_(2)O` ....(iii) Due to evolution of large amount of heat during combustion, alkanes are used as fuels. `C_(8)H_(18) + (25)/(2)O_(2(g)) rarr 8CO_(2) + 9H_(2)O` Uses : GAS used in homes for kitchen, vehicles, trains, bus, car, aeroplane etc. |
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