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A cooking gas cylinder is assumed to con...

A cooking gas cylinder is assumed to contain `11.2kg` isobutane. The combustion of isobutane is given by `:`
`C_(4)H_(10(g))+(13//2)O_(2(g)) rarr 4CO_(2(g))+5H_(2)O_((l)), DeltaH=-2658kJ mol^(-1)` `(a)` If a family needs `15000kJ` of energy per day for cooking, how long would the cylinder last ?
`(b)` Assuming that `30%` of the gas is wasted due to incomplete combustion, how long would the cylinder last ?

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