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The thermochemical equation for the comb...

The thermochemical equation for the combustion of ethylene gas, `C_(2)H_(4)`, is
`C_(2)H_(4)(g) rarr 2CO_(2)(g) +2H_(2)O(l), DeltaH^(Theta) =- 337 kcal`
Assuming `70%` efficiency, calculate the weight of water at `20^(@)C` that can be converted into system at `100^(@)C` by buring `1m^(3)` of `C_(2)H_(4)` gas measured at `STP`. The heat of vaporisation of water at `20^(@)C` and `100^(@)C` are `1.00 kcal kg^(-1)` and `540 kcal kg^(-1)` respectively.

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