Home
Class 11
CHEMISTRY
From the following enthalpies of combuti...

From the following enthalpies of combution, deduce which of the quoted expressions gives the heat of formation at a fixed temp.
`C(s) +O_(2) (g) rarr CO_(3)(g) , DeltaH=c`
`H_(2)(g)+1//2O_(2)(g) rarr H_(2)O(l),Delta =h`
`CH_(4)(g)+2O_(2)(g) CO_(2)(g)+2H_(2)O(l),Delta H=m`

A

c+h-m

B

c-h+m

C

c+2h-m

D

`-1//2`c-h+1/2 m

Text Solution

Verified by Experts

The correct Answer is:
C
`C(s) +2H_(2)(g) to CH_(4) " "DeltaH_(f)=?`
To obtain this equation (i) + 2 `xx (ii)-(iii)`
`DeltaH_(f)=c+ 2h-m`
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR AND RADIO CHEMISTRY

    DINESH PUBLICATION|Exercise Unit Test 4|40 Videos

  • NOMENCLATURE OF ORGANIC COMPOUNDS

    DINESH PUBLICATION|Exercise MCQs|13 Videos

  • ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES & TECHNIOUES

    DINESH PUBLICATION|Exercise PURIFICATION & CHARACTERISATION OF ORGANIC COMPOUNDS|38 Videos

Similar Questions

Explore conceptually related problems

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(+-?)

Find the heat of formation of ethal alcohol from following data : {:(C(s)+O_(2)(g)rarrCO_(2)(g)",",,Delta H=-94 kcal),(H_(2)(g)+(1)/(2)O_(2)(g)rarr H_(2)O(l)",",,Delta H=-68 kcal),(C_(2)H_(5)O(l)+3O_(2)(g)rarr 2CO_(2)(g)+3H_(2)O(l)",",,Delta H=-327 kcal):}

In the reaction 2H_(2)(g) + O_(2)(g) rarr 2H_(2)O (l), " "Delta H = - xkJ

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 :-

Calculate the enthalpy of formation of methane from the following data : C(s) + O_(2)(g) to CO_(2)(g) Delta_(r)H^(@) = -393.5 kJ 2H_(2)(g) + O_(2)(g) to 2H_(2)O(l) Delta_(r)H^(@) = -571.8 kJ CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(l) Delta_(r)H^(@) = -890.3 kJ

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

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

DINESH PUBLICATION-NUCLEAR AND RADIO CHEMISTRY-Evaluate Yourself
  1. The expected wavelength at which the first line of P fund series shall...

    Text Solution

    |

  2. The correct order of electron affinity among (i) Na (ii) Mg (iii) F ...

    Text Solution

    |

  3. From the following enthalpies of combution, deduce which of the quoted...

    Text Solution

    |

  4. The combustion of benzoic acid occurs according to expression C(6)H(...

    Text Solution

    |

  5. During the solid-liquid transition at the melting point

    Text Solution

    |

  6. From amogst Al^(3+), Cl^(-), K^(+), N^(3-), the correct order of radii...

    Text Solution

    |

  7. The enthaply change, DeltaH, in a simple one step reaction is gt 0, so...

    Text Solution

    |

  8. The half life of a first order reaction is 60 sec . The percentage of ...

    Text Solution

    |

  9. If the reaction , A + B to C+D , is thermodynamically feasible, the ti...

    Text Solution

    |

  10. For a hypothetical reaction, the following kinetic data suggested that...

    Text Solution

    |

  11. A reaction rate contant doubles between 300 and 310 k. By which of the...

    Text Solution

    |

  12. If t(0.5) of a first order reaction, PCl(5) to PCl(3) + Cl(2) is 10 mi...

    Text Solution

    |

  13. The d-orbital involved in sp^3d hybridisation is

    Text Solution

    |

  14. A molecules ML(5) contains 5 s bonding pairs of electrons and one non-...

    Text Solution

    |

  15. If heat of formation of HI in the given reactions (i) H(2)(g) + I(2)...

    Text Solution

    |

  16. The entropy change produced in universe when 3.6 kg of water of 47^(@)...

    Text Solution

    |

  17. A sample of radioactive element undergoes 90% decomposition in 336 min...

    Text Solution

    |

  18. The vant Hoff factor (i) for a dilute solution of potassium aluminium ...

    Text Solution

    |

  19. A 0.01 M solution of glucose in water freezes at -0.0186^(@)C A 0.01 M...

    Text Solution

    |

  20. 20 mL of HCl having a certain normality neutralises exactly 1.0 g CaCO...

    Text Solution

    |