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If C(s)+O(2)(g)to CO(2)(g),DeltaH=rand C...

If `C(s)+O_(2)(g)to CO_(2)(g),DeltaH=rand CO(g)+1/2O_(2)to CO_(2)(g),DeltaH=s` then, the heat of formation of CO is

A

`r + s`

B

`r - s`

C

`s - r`

D

`rs`

Text Solution

Verified by Experts

The correct Answer is:
B
`C(S) + O_(2)(g) to CO_(2)(g) , DeltaH = r`
`CO(g) + 1/2 O_(2)(g) to CO_(2)(g), DeltaH = s`
`C(s) + 1/2 O_(2)(g) to CO(g) , DeltaH = ?`
Subtract Eq. (ii) from Eq. (i)
`{:(C(s) + O_(2)(g) to CO_(2)(g), , DeltaH = r),(Co(g)+1/2O_(2)(g) to CO_(2)(g),,DeltaH = s):}/(C(s)+1/2O_(2)(g) to co(g),, DeltaH = r - s)` .
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