1.

The heat evolved in the combustion of 112 L ofwater gas( CO + H_(2) in the ration of1:1 by volume) is ( Giventhat heats of combustion of H_(2) andCO are -241.8and -283 kJ mol^(-1) respectively.

Answer»

`- 1414 . 0 kJ`
`-1209.0 kJ`
`- 1312.0 kJ`
`- 524.8 kJ`

SOLUTION : `H_(2)+(1)/(2) O_(2) rarr H_(2)O, DeltaH =- 241.8kJ`
`CO +(1)/(2) O_(2) rarr CO_(2), DeltaH = - 283kJ`
Since, `H_(2)` and CO have same volume in the MIXTURE, THEREFORE, each `= 56L `
`DeltaH` for combustion of `56L ` of `H_(2)`
`=-( 241.8) /( 22.40 xx56kJ = - 604.5 kJ`
`DeltaH`for combustionof `56 L ` of CO
`= - ( 283)/( 22.4) XX 56 kJ = - 707 .5 kJ`
`:. `Total `DeltaH = - 604 + ( - 707.5) = -1312kJ`


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