Home
Class 12
CHEMISTRY
Values of heats of formation for SiO(2) ...

Values of heats of formation for `SiO_(2)` and `MgO` are `-48.4` and `-34.7 kJ` respectively. The heat of the reaction `2Mg+SiO_(2)rarr2MgO+Si` is

A

21.0 kJ

B

`-21.0`kJ

C

13.7 kJ

D

`-13.7`kJ

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYNAMICS AND ENERGETICS

    TARGET PUBLICATION|Exercise COMPETITIVE THINKING|97 Videos

  • CHEMICAL THERMODYNAMICS AND ENERGETICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|25 Videos

  • CHEMICAL THERMODYNAMICS AND ENERGETICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|25 Videos

  • CHEMICAL KINETICS

    TARGET PUBLICATION|Exercise Evaluation test|13 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    TARGET PUBLICATION|Exercise 7|3 Videos

Similar Questions

Explore conceptually related problems

Heats of formation of SiO_(2) and MgO are -48.24 and -34.7 kJ respectively. The heat of the reaction : 2Mg+SiO_(2) rarr 2MgO+Si is

In SiO_(2)

The heats of combustion for C, H_(2) and CH_(4) are -349, -241.8 and -906.7 kJ respectively. The heat of formation of CH_(4) is

SiO_(2) is a/an

The values of heat of formation of SO_(2) and SO_(3) are - 298.2 kJ and - 98.2 kJ. The heat of reaction of the following reaction will be SO_(2)(g)+(1)/(2)O_(2)(g)to SO_(3)(g)

The values of heat of formation of SO_2 and SO_3 and -298.2 kJ and -98.2 kJ. The heat of reaction of the following reaction will be: SO_2 + 1/2 O_2 to SO_3 ,___________.

The heat of combustion of C, S and CS_(2) are -393.3kJ, -293.7kJ and -1108.76kJ. What will be the heat of formation of CS_(2) ?

TARGET PUBLICATION-CHEMICAL THERMODYNAMICS AND ENERGETICS -CRITICAL THINKING
  1. When 2mole of C(2)H(6) are completely burnt -3129kJ of heat is liberat...

    Text Solution

    |

  2. The enthalpy of formation of ammonia is -46.0 kJ mol^(-1). The enthalp...

    Text Solution

    |

  3. Values of heats of formation for SiO(2) and MgO are -48.4 and -34.7 kJ...

    Text Solution

    |

  4. In the combustion of 11 g of CO(2(g)), 100 kJ of heat is liberated. He...

    Text Solution

    |

  5. The heat of formations of CO((g)) and CO(2(g)) are -26.4 kcal and -94....

    Text Solution

    |

  6. In the combustion of 2.0 g of methane 25 kcal heat is liberated, heat ...

    Text Solution

    |

  7. The heat evolved in combustion of benzene is given by the following eq...

    Text Solution

    |

  8. Standard enthalpies of formation of O(3),CO(3),NH(3) and HI are 142.2,...

    Text Solution

    |

  9. The heat of atomisation of PH(3(g)) is 228kcal mol^(-1) and that of P(...

    Text Solution

    |

  10. Given the bond energirs N=N,H-H and N-H bonds are 945,436 and 391KJmol...

    Text Solution

    |

  11. Given: (i) S+O2 to SO2, Delta H=-298.2 kJ (ii) SO2 + 1/2 O2 to SO3...

    Text Solution

    |

  12. Calculate the enthalpy of hydrogenation of C2 H(4(g)), given that the...

    Text Solution

    |

  13. Heat of formation of H2 O((l)), CO(2(g)) "and" C2 H(4(g)) are -285.0, ...

    Text Solution

    |

  14. The combustion enthalpies of carbon, hydrogen and methane are -395.5 "...

    Text Solution

    |

  15. The standard molar heat of formation of ethane, CO2 "and" H2 O((l)) "a...

    Text Solution

    |

  16. The H2 O((g)) molecule dissociates as (i) H2 O((g)) to H((g)) + OH((...

    Text Solution

    |

  17. Given: 2C((s)) + 2O(2(g)) to 2CO(2(g)), Delta H1 =-767 kJ …(i) H...

    Text Solution

    |

  18. The standard ethelpy of combustion at 25^(@)C of hydrogen, cyclohexene...

    Text Solution

    |

  19. Diborane is a potential rocket fuel which undergoes combustion accordi...

    Text Solution

    |

  20. The standard heat of combustion of solid boron is equal to

    Text Solution

    |