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2C((s))  + 1/2O(2(gg) rarr CO(2(g)) , De...

`2C_((s))  + 1/2O_(2(gg) rarr CO_(2(g)) , DeltaH = -787 KJ`
`H_(2(g)) + 1/2O_(2(g)) rarr H_2O_((l)) , DeltaH = -286 KJ`
`C_2H_(2(g)) + 2 1/2O_(2(g)) rarr 2CO_(2(g)) + H_2O_((l)) , DeltaH = -1301 KJ`. 
Heat of formation of acetylene in KJ is 

A

`-1802`

B

`+1802`

C

`-800`

D

`+228`

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-CHEMICAL THERMODYNAMICS-PRACTICE EXERCISE
  1. The enthalpy of formation of ammonia is -46.0 KJ mol^(-1). The enthalp...

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  2. Which of the following bond has highest enthalpy

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  3. 2C((s))  + 1/2O(2(gg) rarr CO(2(g)) , DeltaH = -787 KJ H(2(g)) + 1/2...

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  4. Heats of combustion of C2H4, H2 and C2H6 are -1409 K.J, -285 K.J and -...

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  5. The enthalpy of combustion of cyclohexane cyclohexene and H2 are respe...

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  6. Given that CH3CHO + 5/2O2 rarr 2CO2 + 2H2O, DeltaH = -1168 KJ//"mole...

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  7. The enthalpy of vapourisation of a liquid is 30 KJ mol^(-1) and entrop...

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  8. H(2(g)) rarr 2H((g)) , DeltaH = 400 KJ , then DeltaS("system") at 2000...

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  9. Show that A ∪ B = A ∩ B implies A = B

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  10. Standard molar entropies of Mg((s)) , C((s)), MgO((s)) & CO((g)) respe...

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  11. DeltaH and DeltaS for certain reaction are -10KJ and - 44J/K, DeltaG^@...

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  12. S^@ of N2, H2 and NH3 respectively are 190, 130 & 111 J/K/mol, then D...

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  13. Kp for the reaction 3/2O(2(g)) overset(rarr)(larr)O(3(g)) at 25^@C is ...

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  14. Zn((s)) + Cu((aq))^(+2) -> Cu((s)) + Zn((aq))^(+2), DeltaG = -XKJ, C...

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  15. For a process change in enthalpy is 36 kJ.mol and change in entropy is...

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  16. For which of the following cases DeltaS = (DeltaH)/T

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  17. Calculate work done when 1 mole of an ideal gas is expanded reversibly...

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  18. The entropy change in adiabatic process is

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  19. If w1, w2, w3, and we are work done in isothermal adiabatic, isobaric ...

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  20. Molar heat capacity (C(p)) of water of constant pressure is 75JK^(-1) ...

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