1.

Given thatC_((g)) + O_(2(g)) to CO_(2(g))DeltaH^(@) =- 1KJ , 2 CO_((g))+O_(2(g)) to2CO _(2(g)) DeltaH^@=- b KJ , calculatetheDeltaH^@ for thereactionC_((g))+1//2 O_(2(g)) to CO_((g))

Answer»

`(b+2A)/(2)`
`2a-b`
`(2a-b)/(2)`
`(b-2a) /(2)`

Solution :`(b-2a) /(2)`
`C +O_2to CO_2 "" DeltaH^(@)=- a KJ ………(1)`
` 2CO +O_2 to2CO_2"" DeltaH^@=- bKJ………(2)`
`C + ^(1//2 )toCO"" DeltaH^@ =?`
` (1)xx 2 `
` 2C+ 2O_2toCO_2Delta H^@=-2a KJ ........ (3)`
reverseofrequation(2)willbe
` 2CO_2to2CO +O_2DeltaH^@ = b-2aKJ.....(5)`
`(5)div2 `
` C+ O _2toCO""DeltaH^@= (b-2a)/(2) KJ`


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