Home
Class 12
CHEMISTRY
When 2mole of C(2)H(6) are completely bu...

When 2mole of `C_(2)H_(6)` are completely burnt `-3129kJ` of heat is liberated. Calculate the heat of formation of `C_(2)H_(6).Delta_(f)H^(Theta)` for `CO_(2)` and `H_(2)O` are `-395` and `-286kJ`, respectively.

Text Solution

Verified by Experts

`2C_(2)H_(6)(g)+7O_(2)(g)rarr 4CO_(2)(g)+6H_(2)O(l) , Delta H=-3129 kJ`
`Delta H_("reaction")=Sigma Delta H_("products")-Sigma Delta H_("reac tan ts")`
`-3129 =[4xxDelta_(f)H_(CO_(2))+6xxDelta_(f)H_(H_(2)O)]-[2xxDelta_(f)H_(C_(2)H_(6)]`
`2Delta_(f)H_(C_(2)H_(6))=-167` kJ [for elements `Delta H = 0`]
`Delta_(f)H_(C_(2)H_(6))=-83.5 kJ`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -1A|41 Videos

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -1B|22 Videos

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -4|18 Videos

  • TEST PAPERS

    ALLEN|Exercise MATHEMATICS|2 Videos

  • Thermodynamics And Thermo Chemistry

    ALLEN|Exercise All Questions|40 Videos

Similar Questions

Explore conceptually related problems

The standard enthalpy of formation of octane (C_(8)H_(18)) is -250kJ //mol . Calculate the enthalpy of combustion of C_(8)H_(18) . The enthalpy of formation of CO_(2)(g) and H_(2)O(l) are -394 kJ//mol and -286kJ//mol respectively.

The combustion of 1 mol of benzene takes place at 298 K and 1 atm . After combustion, CO_(2)(g) and H_(2)O(l) are produced and 3267.0 kJ of heat is librated. Calculate the standard entalpy of formation, Delta_(f)H^(Θ) of benzene Given: Delta_(f)H^(Θ)CO_(2)(g) = -393.5 kJ mol^(-1) Delta_(f)H^(Θ)H_(2)O(l) = -285.83 kJ mol^(-1) .

Change in enthalpy for reaction 2H_(2)O_(2)(l)rarr2H_(2)O(l)+O_(2)(g) if heat of formation of H_(2)O_(2)(l) and H_(2)O(l) are -188 and -286KJ//mol respectively is

The heats of combustion of carbon,hydrogen and acetylene are -394kJ, -286kJ and -1301kJ respectively. Calculate heat of formation of C_(2)H_(2)

The heats of combustion of C_(2)H_(4(g)), C_(2)H_(6(g)) and H_(2(g)) are -1409.4,-1558.3 and -285.6 kJ respectively. Calculate heat of hydrogenation of ethylene.

Ethylene on combustion gives carbon dioxide and water. Its heat of combustion is 1410.0 kJ mol^(-1) . If the heat of formation of CO_(2) and H_(2)O are 393.3 kJ and 286.2 kJ , respectively. Calculate the heat of formation of ethylene.

Ethylene on combustion gives carbon dioxide and water. Its heat of combustion is 1410.0 kJ mol^(-1) . If the heat of formation of CO_(2) and H_(2)O are 393.3 kJ and 286.2 kJ , respectively. Calculate the heat of formation of ethylene.

Calculate the ethalpy of combustion of ethylene (g) to form CO_(2) (gas) and H_(2)O (gas) at 298 K and 1 atmospheric pressure. The enthalpies of formation of CO_(2),H_(2)O and C_(2)H_(4) are -393.7, -241.8+52.3 kJ per mole respectively.

The heat of formation of C_(2)H_(5)OH(l) is -66 kcal//"mole" . The heat of combustion of CH_(3)OCH_(3) (g) is -348 kcal/mole. DeltaH_(f) for H_(2)O and CO_(2) are -68 kcal/mole respectively. Then, the Delta H for the isomerisation reaction C_(2)H_(5)OH(l)rarrCH_(3)OCH_(3)(g) ,and Delta E for the same are at T=25^(@)C

The heats of combustion of C_(2)H_(4), C_(2)H_(6) and H_(2) gases are -1409.5 KJ, -1558.3 KJ and -285.6 KJ respectively. The heat of hydrogenation of ethene is

ALLEN-THERMODYNAMICS -Questions
  1. Which of the following statement is incorrect. (i) Entropy is measur...

    Text Solution

    |

  2. For the chemical equilibrium PCl(5)(g) hArr PCl(3)(g) +Cl(2) (g) " a...

    Text Solution

    |

  3. Four moles of an ideal gas expand isothermally from 1 litre to 10 litr...

    Text Solution

    |

  4. Delta H(f)^(@) for Al(2)O(3) is -1670 KJ. Calculate the enthalpy chan...

    Text Solution

    |

  5. Standard heat of formation of caebonmonooxide at 298 K is -110.5 kJ. C...

    Text Solution

    |

  6. Find the heat of formation of ethyl alcohol for following data C(s) ...

    Text Solution

    |

  7. Find Delta H(f)^(@) of Fe(2)O(3)(s) if the standard heat reaction Fe(2...

    Text Solution

    |

  8. Calculate the heat of formation of KCl from the following data : {:(...

    Text Solution

    |

  9. Standard heat of formation of CH(4)(g), CO(2)(g) and H(2)O(l) are -75,...

    Text Solution

    |

  10. Calorific value of glucose from the following reaction will be C(6)H(1...

    Text Solution

    |

  11. The heat of formation of CO(2) and H(2)O is -97 kcal and -68 kcal. The...

    Text Solution

    |

  12. When 2mole of C(2)H(6) are completely burnt -3129kJ of heat is liberat...

    Text Solution

    |

  13. Calculate the ethalpy of combustion of ethylene (g) to form CO(2) (gas...

    Text Solution

    |

  14. A cylinder of cooking gas is assumed to contain 11.2 kg of butane. The...

    Text Solution

    |

  15. What would be the heat released when 200 cm^3 of 0.1 M H2SO4 solution ...

    Text Solution

    |

  16. Bond dissociation energies of H(2),Cl(2) and HCl((g)) are 104, 58 and ...

    Text Solution

    |

  17. The standard heat of formation of CS(2)(I) will be, given that the sta...

    Text Solution

    |

  18. Acetic acid (ethanoic acid) and hydrochloric acid react with KOH solut...

    Text Solution

    |

  19. The Bond energy of C=C, C-C, C-H and H-H are 147, 83, 99 and 104 kcal/...

    Text Solution

    |

  20. Diborane is a potential rocket fuel that undergoes combustion accordin...

    Text Solution

    |