Home
Class 11
CHEMISTRY
When 1g liquid naphthalene (C(10)H(8)) s...

When `1g` liquid naphthalene `(C_(10)H_(8))` solidifies, `149J` of heat is evolved. Calculate the enthalpy of fusion of naphthalene.

Text Solution

Verified by Experts

Molecular weight of naphthalene

`1g` of naphthalene given heat `= 149 J`
`:. 128 g gives rArr 149 xx 128 rArr 19072 J`
`Delta_(f)H = + 19072 J`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    CENGAGE CHEMISTRY|Exercise Exercises (Linked Comprehension)|74 Videos

  • THERMODYNAMICS

    CENGAGE CHEMISTRY|Exercise Exercises (Multiple Correct)|50 Videos

  • THERMODYNAMICS

    CENGAGE CHEMISTRY|Exercise Ex 6.5|30 Videos

  • STOICHIOMETRY

    CENGAGE CHEMISTRY|Exercise Archives Subjective|33 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 CO_(2)(g) and H_(2)O(l) are -394 kJ//mol and -286kJ//mol respectively.

The combustion of butane (C_(4)H_(10)) is exothermic by 2878.7 kJ "mol"^(-1) .Calculate the standard enthalpy of formation of butane given that the standard enthalpies of formation of CO_(2)(g) and H_(2)O(l) are -393.5 kJ "mol"^(-1) and -285.8 kJ "mol"^(-1) respectively.

The boiling point of CHCl_(3) was raised by 0.323^(@)C when 0.37 g of naphthalene was dissolved in 35 g CHCl_(3) . Calculate the molecular weight of naphthalene. (k'_(b) "for" CHCl_(3)= 3.9Kmol^(-1) kg) .

CENGAGE CHEMISTRY-THERMODYNAMICS-Exercises (Subjective)
  1. If 2AI(s) +1(1)/(2) O(2)(g) rarr AI(2)O(3)(s), DeltaH =- 1667.8 kJ H...

    Text Solution

    |

  2. The thermochemical equation for solid and liquid rocket fuel are given...

    Text Solution

    |

  3. When 1g liquid naphthalene (C(10)H(8)) solidifies, 149J of heat is evo...

    Text Solution

    |

  4. a. A cylinder of gas is assumed to contain 11.2 kg of butane. If a nor...

    Text Solution

    |

  5. The free enegry changes for the two reactions given below are a. SO(...

    Text Solution

    |

  6. Given that: i. C("graphite") +O(2)(g) rarr CO(2)(g), DeltaH =- 393.7...

    Text Solution

    |

  7. Given: i. H(g) +CI(g) rarr HCI(g) DeltaH =- 431 kJ ii. HCI(g) +aq ...

    Text Solution

    |

  8. Given: NaCI(s) +aq rarr Na^(o+) (aq) +CI^(Theta) DeltaH = 3.9 kJ N...

    Text Solution

    |

  9. What would be the heat released when:

    Text Solution

    |

  10. Enthalpy of neutralisation of acetic acid by NaOh is -50.6 kJ mol^(-1)...

    Text Solution

    |

  11. The polymerisation of ethylene to linear polyethylene is represented b...

    Text Solution

    |

  12. An athelete is given 100g of glucose (C(6)H(12)O(6)) of energy equival...

    Text Solution

    |

  13. How much hea is liberated when one mole of gaseous Na^(o+) combines wi...

    Text Solution

    |

  14. State a chamical reaction in which DeltaH and DeltaU are equal .

    Text Solution

    |

  15. Which of the following is an intensive property. Surface tension, mass...

    Text Solution

    |

  16. State the first law of thermodynamics.

    Text Solution

    |

  17. For the reactions, N(2)(g) +3H(2)(g) rarr 2NH(3)(g) predict, whether t...

    Text Solution

    |

  18. Which has larger absolute entropy per mole? a. H(2)O(l) at 298 K or ...

    Text Solution

    |

  19. The dissolution of ammonium chloride in water is an endothermic proces...

    Text Solution

    |

  20. Does an aqueous solution of Mg^(2+) ions have larger entropy before or...

    Text Solution

    |