Home
Class 12
CHEMISTRY
Calculate the heat of combustion of benz...

Calculate the heat of combustion of benzene form the following data:
a. `6C(s) +3H_(2)(g) rarr C_(6)H_(6)(l), DeltaH = 49.0 kJ`
b. `H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.8 kJ`
c. `C(s) +O_(2) (g) rarr CO_(2)(g), DeltaH =- 389.3 kJ`

A

`+ 3172.8` kJ

B

`- 1549.2` kJ

C

`- 3172.8` kJ

D

`- 3264.6` kJ

Text Solution

Verified by Experts

The correct Answer is:
D
Mulitply eq. (ii) by (iii) and eq. (iii) by (vi), and then add `6C+3H_(2)+(15)/(2)O_(2)rarr6CO_(2)+6H_(2)O, DeltaH=3218.7` Subtract eq. (i) from the above equation and find the required result.
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS |Exercise ORDINARY THINKING (Objective Questions) Bond energy|15 Videos

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS |Exercise ORDINARY THINKING (Objective Questions) Free energy and Work function|57 Videos

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS |Exercise ORDINARY THINKING (Objective Questions) First law of thermodynamics and Hess law|100 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    ERRORLESS |Exercise JEE Section (Matrix Match type questions)|3 Videos

Similar Questions

Explore conceptually related problems

Calculate the heat of formation of n butane from the followinf data: a. 2C_(4)H_(10)(g) +13O_(2)(g) rarr 8CO_(2)(g) +10H_(2)O(l), DeltaH = - 5757.2 kJ b. C(s) +O_(2) (g)rarrCO_(2)(g), DeltaH =- 405.4 kJ c. 2H_(2)(g) +O_(2)(g) rarr 2H_(2)O(l), DeltaH =- 572.4 kJ

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

H_(2)(g)+(1)/(2)O_(2)(g)rarr2H_(2)O(l), DeltaH =- 286 kJ 2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l)……………kJ(+-?)

Calculate the enthalpy of formation of ethane from the following data : (i) C(s) + O_(2)(g) to CO_(2)(g) , Delta_(r)H^(@) = -393.5 kJ (ii) H_(2)(g) + 1/2 O_(2)(g) to H_(2)O(l), Delta_(r)H^(@) = -285.8 kJ (iii) C_(2)H_(6)(g) + 7/2O_(2)(g) to 2CO_(2)(g) + 3H_(2)O(l), Delta_(r)H^(@) = -1560.0 kJ

Calculate the enthalpy of combustion of glucose from the follwoing data : C("graphite") +O_(2)(g) to CO_(2)(g) Delta_(r)H^(@) = -395.0 kJ H_(2)(g) + 1/2 O_(2)(g) to H_(2)O(l) Delta_(r)H^(@) = - 269.4 kJ 6C("graphite") + 6H_(2)(g) + 3O_(2)(g) to C_(6)H_(12)O_(6)(s) Delta_(r)H^(@) = -1169.9 kJ

Calculate the heat of combustion (in KJ) of methane from the following data (i) C ("graphite")+2H_(2)(g) rarr CH_(4) (g), DeltaH=-74.8 kJ (ii) C ("graphite")+O_(2) (g) rarr CO_(2) (g), DeltaH=-393.5 kJ (iii) H_(2(g))+1//2O_(2(g)) rarr H_(2)O_((l)), DeltaH=-286.2 kJ .

Calculate the heat of formation of acetic acid form the following date: a. CH_(3)COOH(l) +2O_(2)(g) rarr 2CO_(2)(g) +2H_(2)O(l)DeltaH^(Theta) =- 200.0kcal b. C(s) +O_(2) (g) rarr CO_(2)(g), DeltaH^(Theta) =- 94.0 kcal c. H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(l), DeltaH^(Theta) =- 68.0 kcal

ERRORLESS -THERMODYNAMICS AND THERMOCHEMISTRY -ORDINARY THINKING (Objective Questions) Heat of reaction
  1. What is the weight of oxygen required for the complete combustion of 2...

    Text Solution

    |

  2. For CaCO(3)(s)rarr CaO(s)+CO(2)(g) at 977^(@)C, Delta H = 174 KJ/mol ,...

    Text Solution

    |

  3. When 5 litres of a gas mixture of methane and propane is perfectly com...

    Text Solution

    |

  4. Given : (i) C("graphite") + O(2)(g) rarr CO(g) ,Delta(r )H^(@) = xkJ...

    Text Solution

    |

  5. What would be the heat released when an aqueous solution containing 0....

    Text Solution

    |

  6. Which of the following statement is correct

    Text Solution

    |

  7. Correct relationship between heat of fusion (DeltaH(fus)), heat of vap...

    Text Solution

    |

  8. Enthalpy change for reaction 1//2H(2)(g)+1//2Cl(2)(g)toHCl(g) is...

    Text Solution

    |

  9. The enthalpy of neutralization is about 57.3 kJ for the pair

    Text Solution

    |

  10. Heat of combustion of CH(4),C(2)H(6), C(2)H(4) and C(2)H(2) gases are ...

    Text Solution

    |

  11. Heat of formation of CO(2)(g),H(2)O(l)andCH(4)(g)"are"-94,-68.4 and-17...

    Text Solution

    |

  12. The heat change Delta H for the reaction 2 CO +O2to 2 CO2, Delta H=-...

    Text Solution

    |

  13. The heat of formation of H(2)O(l) is -68.0 kcal, the heat of formation...

    Text Solution

    |

  14. The heat of combustion of carbon is -94 kcal at 1 atm pressure. The in...

    Text Solution

    |

  15. The heat of combustion of benzene determined in a bomb calorimeter is ...

    Text Solution

    |

  16. The standard heats of formation in Kcal mol^(-1) of NO(2)(g) and N(2)O...

    Text Solution

    |

  17. Calculate the heat of combustion of benzene form the following data: ...

    Text Solution

    |

  18. Assertion:The enthalpies of neutralised of strong acids and strong bas...

    Text Solution

    |

  19. Assertion (A): The heat of neutralisation of perchloric acid, HCIO(4),...

    Text Solution

    |

  20. The bond dissociation energies ofX(2),Y(2)andXY are in the ratio of1:0...

    Text Solution

    |