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If enthalpies of formation of C(2)H(4)(g...

If enthalpies of formation of `C_(2)H_(4)(g),CO_(2)(g)` and `H_(2)O(l)` at `25^(@)C` and 1 atm pressure are 52, -394 and -286 KJ/mol , the enthalpy of combustion of ethane is equal to

A

`+1412 "KJ mole"^(-1)`

B

`-1412 "KJ mole"^(-1)`

C

`+142.2 "KJ mole"^(-1)`

D

`-141.2 "KJ mole"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(2)H_(2(g))+3O_(2(g))rarr 2CO_(2(g))+2H_(2)O_((l)) , Delta H_("Comb.") = ?`
`Delta H = S?igma (Delta H_(f))_(P)-Sigma (Delta H_(f))_(R )`
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ALLEN-THERMODYNAMICS -EXERCISE -3
  1. Heat of combustion of CH(4), C(2)H(6), C(2)H(4) and C(2)H(2) gases are...

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  2. The standard enthalpy of formation of CO is -110 kJ and of CO2 is -394...

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  3. If enthalpies of formation of C(2)H(4)(g),CO(2)(g) and H(2)O(l) at 25^...

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  4. The heat of combustion of carbon and monoxide are -394 and -285 KJ mol...

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  5. When a certain amount of ethylene was combusted, 6226 kJ heat was evol...

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  6. Find out the heat evolved in combustion if 112 litre (at 1 atm, 273 K)...

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  7. A person requires 2870 kcal of energy to lead normal daily life. If he...

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  8. On complete combustion of 2 gm methane 26575 cals of heat is generated...

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  9. X gm of ethanal was subjected to combustion in a bomb calorimeter and ...

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  10. The following are heats of reactions : (A) DeltaH(f)^(@) of H(2)O(l)...

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  11. The enthalpy combustion of a substance

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  12. The value of Delta H for the combustion of C(s) is - 94.4 Kcal. The he...

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  13. In the combustion of 0.4 g. of CH(4) 0.25 Kcal. Of heat is liberated. ...

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  14. If C(6)H(12)O(6)(s) +6O(2)(g) to 6CO(2)(g)+6H(2)O (l), triangleH=680 K...

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  15. Which of the following equations corresponds to the enthalpy of combus...

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  16. Heat of formation of CO2 is 94.0 K.cal. What would be thequantity of h...

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  17. The amount of heat liberated when one mole of NH(4)OH reacts with one ...

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  18. If H^(+)+OH^(-)to H(2)O(l)+13.7 Kcal, then the value of heat of neutra...

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  19. The heat of neutralisation of a strong dibasic acid in dilute solution...

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  20. The temperature of a 5mL of strong acid increases by 5^(@) when 5 mL o...

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