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Using the following thermochemical data....

Using the following thermochemical data.
`C(S)+O_(2)(g)rarr CO_(2)(g), Delta H=94.0` Kcal
`H_(2)(g)+1//2O_(2)(g)rarr H_(2)O(l), Delta H=-68.0` Kcal
`CH_(3)COOH(l)+2O_(2)(g)rarr 2O_(2)(g)rarr 2CO_(2)(g)+2H_(2)O(l), Delta H=-210.0` Kcal
The heat of formation of acetic acid is :-

A

116.0 Kcal

B

`-116.0` Kcal

C

`-114.0` Kcal

D

`+114.0` Kcal

Text Solution

Verified by Experts

The correct Answer is:
C
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Given that: i. C(s) + O_(2)(g) rarr CO_(2)(g) , DeltaH =- 94.05 kcal ii. H_(2)(g) +(1)/(2) O_(2)(g) rarr H_(2)O(l), DeltaH =- 68.32 kcal iii. C_(2)H_(2)(g) +(5)/(2) O_(2)(g) rarr 2CO_(2)(g) +H_(2)O(l),DeltaH =- 310.62 kcal The heat of formation fo acetylene is

Find the heat of formation of ethyl alcohol for following data C(s) +O_(2)(g) rarr CO_(2)(g) DeltaH =- 94 kcal H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 68 kcal C_(2)H_(5)OH(l)+3O_(2)(g) rarr 2CO_(2)(g) +3H_(2)O(l) DeltaH =- 327 kcal

Knowledge Check

  • In the reaction C_((s)) +O_(2(g)) rarr CO_(2(g)), Delta H =-94.3 Kcal

    A
    `H_(P) gt H_(R)`
    B
    `H_(P) lt H_(R)`
    C
    `H_(P) = H_(R)`
    D
    `H_(P)=2H_(R)`

  • Given that 2C(s)+2O_(2)(g)rarr2CO_(2)(g), DeltaH=-787 kJ H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l), DeltaH=-286 kJ C_(2)H_(2)(g)+2(1)/(2)O_(2)(g)rarr2CO_(2)(g)+H_(2)O(l), DeltaH=-1301 kJ Heat of formation of acetylene is

    A
    `-1802` kJ
    B
    `+1802` kJ
    C
    `-800` kJ
    D
    `+237` kJ

  • Given that - 2C(s)+2O_(2)(g)rarr 2CO_(2)(g) Delta H = -787 KJ H_(2)(g)+ 1//2O_(2)(g)rarr H_(2)O(l) Delta =-286 KJ C_(2)H_(2)(g)+(5)/(2)O_(2)(g)rarr H_(2)O(l) Delta H=-1310 KJ Heat of formation of acetylene is :-

    A
    `+1802` KJ
    B
    `-1802` KJ
    C
    `-800` KJ
    D
    `+237` KJ

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