Home
Class 12
CHEMISTRY
Given (at 25^(@)C): Ca(s)+(1)/(2)O(2)(...

Given (at `25^(@)C`):
`Ca(s)+(1)/(2)O_(2)(g)toCaO(s),DeltaH^(0)=-635.2kJ*mol^(-1)`
`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l),DeltaH^(0)=-285.8kJ*mol^(-1)`
`CaO(s)+H_(2)O(l)toCa(OH)_(2)(s)`,
`DeltaH^(0)=-65.6kJ*mol^(-1)`
The heat of formation (in `kJ*mol^(-1)`) for `Ca(OH)_(2)`(s) is-

A

`-855.4`

B

`-673.9`

C

`-986.6`

D

`-731.7`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise VERY SHORT TYPE QUESTIONS|53 Videos

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise FILL IN THE BLANKS|23 Videos

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise ENTRANCE QUESTION BANK|53 Videos

  • CHEMICAL KINETICS

    CHHAYA PUBLICATION|Exercise EXERCISE (NUMERICAL PROBLEMS)|37 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    CHHAYA PUBLICATION|Exercise PRACTICE SET 15|15 Videos

Similar Questions

Explore conceptually related problems

H_(2)O(l)toH^(+)(aq)+OH^(-)(aq),DeltaH^(0)=57.32kJ*mol^(-1) H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l),DeltaH^(0)=-285.8kJ*mol^(-1) at 25^(@)C . If DeltaH_(f)^(0)[H^(+)(aq)]=0 , then the standard heat of formation (kJ*mol^(-1)) for OH^(-)(aq) at 25^(@)C is-

Diborane [B_(2)H_(6)(g)] is used as a very effective fuel for rockets. Calculate the heat of combustion of diborane for the following reaction: B_(2)H_(6)(g)+3O_(2)(g)toB_(2)O_(3)(g)+3H_(2)O(g) Given: (1) 2B(s)+(3)/(2)O_(2)(g)toB_(2)O_(3) (s),DeltaH^(0)=-1273kJ*mol^(-1) (2) H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l),DeltaH^(0)=-285.8kJ*mol^(-1) . (3) H_(2)O(l)toH_(2)O(g),DeltaH^(0)=+44kJ*mol^(-1) (4) 2B(s)+3H_(2)(g) to B_(2)H_(6)(g),DeltaH^(0)=+36kJ*mol^(-1) .

Given (at 25^(@)C ): C(s, graphite) +(1)/(2)O_(2)(g)toCO(g),DeltaH^(0)=-110.5kJ*mol^(-1) (1)/(2)O_(2)(g)toO,DeltaH^(0)=+249.1kJ*mol^(-1) CO(g)toC(g)+O(g),DeltaH^(0)=1073.24kJ*mol^(-1) The standard enthalpy change for the process, C(s, graphite) toC(g) at 25^(@)C is-

Given, C(graphite)+ O_(2)(g)toCO_(2)(g),Delta_(r)H^(0)=-393.5kJ*mol^(-1) H_(2)(g)+(1)/(2)(g)toH_(2)O(l),Delta_(r)H^(0)=-285.8kJ*mol^(-1) CO_(2)(g)+2H_(2)O(l)toCH_(4)(g)+2O_(2)(g),Delta_(r)DeltaH^(0)=+890.3kJ*mol^(-1) Based on the above thermochemical equations, the value of Delta_(r)H^(0) at 298K for the reaction, C(graphite) +2H_(2)(g)toCH_(4)(g) , will be-

DeltaH value for the given reactions at 25^(@)C are- C_(3)H_(8)(g)to3C(s)+4H_(2)(g),DeltaH^(0)=103.8kJ*mol^(-1) 2H_(2)(g)+O_(2)(g) to 2H_(2)O(l),DeltaH^(0)=-571.6kJ*mol^(-1) C_(2)H_(6)(g)+(7)/(2)O_(2)(g)to2CO_(2)(g)+3H_(2)O(l),DeltaH^(0)=-1560kJ*mol^(-1) CH_(4)(g)+2O_(2)(g) to CO_(2)(g)+2H_(2)O(l),DeltaH^(0)=-890kJ*mol^(-1) C(s)+O_(2)(g) to CO_(2)(g),DeltaH^(0)=-393.5kJ*mol^(-1) Calculate DeltaH^(0) for the reaction at 25^(@)C C_(3)H_(8)(g)+H_(2)(g)toC_(2)H_(6)(g)+CH_(4)(g)

Given that (at 25^(@)C) : (1)/(2)H_(2)(g)+(1)/(2)O_(2)(g) to OH(g), Delta H^(0)= 38.95 " kJ mol"^(-1) H_(2)(g)+(1)/(2)O_(2)(g) to H_(2)O (g), Delta H^(0) = -241.8 " kJ mol"^(-1) H_(2)(g) to 2H(g), Delta H^(0)= 436.0 " kJ mol"^(-1) O_(2)(g) to 2O (g), Delta H^(0)= 498.3 " kJ mol"^(-1) Calculate Delta H^(0) for the following reaction - (a) OH(g) to H(g)+O(g) (b) H_(2)O(g) to 2H(g)+O(g)

Given C (graphite) + O_(2) (g) to CO_(2) (g) Delta ""_(r) H^(0) = -393.5 k J * mol^(-1) H_(2) (g) + (1)/(2) O_(2) (g) to H_(2) O (l) , Delta ""_(r) H^(0) = -285.8 kJ * mol^(-1) CO_(2) (g) + 2 H_(2) O(l) to CH_(4) + 2 O_(2) (g) , Delta ""_(r)H^(0) = + 890 . 3 kJ * mol^(-1) Based on the above thermochemical equations , the value of Delta ""_(r) H^(0) at 298 K for the reation C(graphite) + 2 H_(2) (g) to CH_(4) (g) will be -

Given: C(s)+O_(2)(g)toCO_(2)(g),DeltaH=-393.5kJ 2H_(2)(g)+O_(2)(g)to2H_(2)O(g),DeltaH=-571.6kJ Calculate DeltaH of the reaction: C(s)+2H_(2)O(g)toCO_(2)(g)+2H_(2)(g) .

CHHAYA PUBLICATION-CHEMICAL THERMODYNAMICS-MCQ HOTSPOT (SINGLE CORRENT TYPE)
  1. For 0.5 mol of an ideal gas, 15 cal of heat is required to raise its t...

    Text Solution

    |

  2. 1 mol of an ideal gas is enclosed in a cylinder fitted with a friction...

    Text Solution

    |

  3. Given (at 25^(@)C): Ca(s)+(1)/(2)O(2)(g)toCaO(s),DeltaH^(0)=-635.2kJ...

    Text Solution

    |

  4. Given (at 25^(@)C): 2FeSO(4)(s)toFe(2)O(3)(s)+SO(2)(g)+SO(3)(g),Delt...

    Text Solution

    |

  5. At 25^(@)C, the standard heats of formation of H(2)O(g),H(2)O(g),H(g) ...

    Text Solution

    |

  6. Given (at 25^(@)C): C(s, graphite)+(1)/(2)O(2)(g)toCO(g),DeltaH^(0)=...

    Text Solution

    |

  7. At 25^(@)C, for the reaction, H^(+)(aq)+OH^(-)(aq)toH(2)O(l),DeltaH^(0...

    Text Solution

    |

  8. The temperature of a bomb calorimeter changes from 25^(@)C to 32.7^(@)...

    Text Solution

    |

  9. In which of the following processes the change in entropy for the syst...

    Text Solution

    |

  10. A system undergoes the process: A to B to C to D. In this process, the...

    Text Solution

    |

  11. At 27^(@)C,DeltaH=+6kJ for the reaction A+2Bto3C. In the reaction, if ...

    Text Solution

    |

  12. An LPG cylinder contains 14 kg of butane. A family requires 2xx10^(4)k...

    Text Solution

    |

  13. For a reaction involving 1 mol of Zn and 1 mol of H(2)SO(4) in a bomb ...

    Text Solution

    |

  14. Assuming that water vapour is an ideal gas, the internal energy change...

    Text Solution

    |

  15. At 25^(@)C and 1 atm pressure, DeltaH and pressure-volume work for the...

    Text Solution

    |

  16. The initial state of 1 mol of an ideal gas is (P(1),V(1),T(1)). The ga...

    Text Solution

    |

  17. At a constant pressure the amount of heat required to raise the temper...

    Text Solution

    |

  18. Enthalpy of fusion of ice at 0^(@)C and 1 atm is 6.02 kJ*mol^(-1). The...

    Text Solution

    |

  19. At given pressure and a temperature of 300K, DeltaS(sys) and DeltaS("s...

    Text Solution

    |

  20. In a reversible process, if changes in entropy of the system and its s...

    Text Solution

    |