1.

If (i)C+O_(2)rarrCO_(2), (ii) C+1//2O_(2)rarrCO, "(iii)"CO+1//2O_(2)rarrCO_(2), the heats of reaction are Q, -12,-10 respectively. Then Q=

Answer»

`-2`
2
`-22`
`-16`

Solution :`C+O_(2)rarrCO_(2),Delta=q`
`C+1//2O_(2)rarrCO,DeltaH=-12"....(i)"`
`CO+1//2O_(2)rarrCO_(2), DeltaH=-10"....(ii)"`
ADDING equation (i) and (ii) we can get
`DeltaH=-12+(-10)=-22`.


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