Home
Class 11
CHEMISTRY
The standard molar heats of formation of...

The standard molar heats of formation of ethane, carbon dioxide, and liquid water are `-21.1, -94.1`, and `-68.3kcal`, respectively. Calculate the standard molar heat of combustion of ethane.

A

`-372 kcal`

B

`-240 kcal`

C

`162 kcal`

D

`183.5 kcal`

Text Solution

Verified by Experts

`C_(2)H_(6)(g) +(7)/(2) O_(2)(g) rarr 2CO_(2)(g) +3H_(2)O(g)`
`DeltaH^(Theta) = 2Delta_(f)H_(CO_(2))^(Theta)+3Delta_(f)H_(H_(2)O)^(Theta)-Delta_(f)H_(C_(2)H_(6))^(Theta)`.
`= 2(-94.1) +3(-68.3)-(-21.1) =- 372 kcal`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    CENGAGE CHEMISTRY ENGLISH|Exercise Exercise|1 Videos

  • THERMODYNAMICS

    CENGAGE CHEMISTRY ENGLISH|Exercise Ex 6.1|26 Videos

  • STOICHIOMETRY

    CENGAGE CHEMISTRY ENGLISH|Exercise Archives Subjective|33 Videos

Similar Questions

Explore conceptually related problems

The standard molar heat of formation of ethane, carbon dioxide and water (liquid) are -21.1, -94.1 and -68.3 kcal respectively. Calculate the standard heat of the following reaction : 2C_2H_6 (g) + 7O_2(g) to 4CO_2(g) + 6H_2O(l)

The heat of formation of ethane is -19.46 kcal . Bond enegries of H-H, C -H and C- C bonds are 104.18, 99.0 and 80.0 kcal , respectively. Calculate the heat of atomisation of graphite.

The molar heats of combustion of C_(2)H_(2)(g) , C (graphite), and H_(2) are -310.62 kcal, -94.05 kcal and -68.32 kcal respectively. Calculate the standard heat of formation of C_(2)H_(2)(g) .

The standard heats of formation of CH_(4)(g), CO_(2)(g) and H_(2)O(g) are -76.0, -390.0 , and -240.0 kJ mol^(-1) , respectively. Calculate the amount of heat evolved by burning 1m^(3) of methane measured under normal conditions.

The heats of combustion of carbon,hydrogen and acetylene are -394kJ, -286kJ and -1301kJ respectively. Calculate heat of formation of C_(2)H_(2)

The standard molar enthalpies of formation of cyclohexane (l) and benzene (l) at 25^(@)C are -156 and +49 kJ mol^(-1) , respectively. The standard enthaly of hydrogenation of cyclohenxene (l) at 25^(@)C is -119 kJ mol^(-1) Use this data to estimate the magnitude of the resonance enegry of benzene.

Ethylene on combustion gives carbon dioxide and water. Its heat of combustion is 1410.0 kJ mol^(-1) . If the heat of formation of CO_(2) and H_(2)O are 393.3 kJ and 286.2 kJ , respectively. Calculate the heat of formation of ethylene.

Ethylene on combustion gives carbon dioxide and water. Its heat of combustion is 1410.0 kJ mol^(-1) . If the heat of formation of CO_(2) and H_(2)O are 393.3 kJ and 286.2 kJ , respectively. Calculate the heat of formation of ethylene.

The enthalpies of combustion of carbon and carbon monoxide in excess of oxygen at 298K and constant pressure are -393.5 and -283.0 kJ mol^(-1) , respectively. Calculate the heat of formation of carbon monoxide at constant volume.

The standard molar enthalpies of formation of cyclohexane and benzene at 25^@C are - 156 and +49 KJ mol^(-1) respectively. The standard enthalpy of hydrogenation of cyclo hexene at 25^@C " is" -116 "KJ mol" ^(-1) . Use this data to estimate the magnitude of the resonance energy of benzene.

CENGAGE CHEMISTRY ENGLISH-THERMODYNAMICS-Archives (Subjective)
  1. The standard molar heats of formation of ethane, carbon dioxide, and l...

    Text Solution

    |

  2. The enthalpies for the following reactions (DeltaH^(Theta)) at 25^(@)C...

    Text Solution

    |

  3. The standared enthalpies of formation at 298K for C C1(g), H(2)O(g), C...

    Text Solution

    |

  4. Given that: i. C(s) + O(2)(g) rarr CO(2)(g) , DeltaH =- 94.05 kcal ...

    Text Solution

    |

  5. The following statement is true only under some specific conditions. W...

    Text Solution

    |

  6. The bond dissociation energies of gaseous H(2),Cl(2), and HCl are 100,...

    Text Solution

    |

  7. The standard molar heat of formation of ethane, carbon dioxide and wat...

    Text Solution

    |

  8. An intimate mixture of ferric oxide and aluminium is used as solid fue...

    Text Solution

    |

  9. The enthalpy of combustion of H(2), cyclohexene (C(6)H(10)) and cycloh...

    Text Solution

    |

  10. CsOH +HCI rarr CsCI +H(2)O, DeltaH =- 13.4 kcal mol^(-1)……….(i) CsOH...

    Text Solution

    |

  11. Determine enthalpy change for, C(3)H(8(g))+H(2(g))rarr C(2)H(6(g))+C...

    Text Solution

    |

  12. Compute the heat of formation of liquid methyl alcohol in kilojoule pe...

    Text Solution

    |

  13. From the following data, calculate the enthalpy change for the combust...

    Text Solution

    |

  14. The standard heat of formation values of SF(6)(g), S(g), and F(g) are ...

    Text Solution

    |

  15. Show that the reaction CO(g) +(1//2)O(2)(g) rarr CO(2)(g) at 300K ...

    Text Solution

    |

  16. A sample of argon gas at 1atm pressure and 27^(@)C expands reversibly ...

    Text Solution

    |

  17. Determine the enthalpy of formation of B(2)H(6)(g) in kJ/mol of the fo...

    Text Solution

    |

  18. The standart potential of the following cell is 0.23 at 15^(@)C and 0....

    Text Solution

    |

  19. When 1pentyne (A) is treated with 4N alcoholic KOH at 175^(@)C, it is ...

    Text Solution

    |

  20. Two moles of a perfect gas undergo the following processes: a. A rev...

    Text Solution

    |

  21. C(v) values of He is always (3R)/(2) but C(v) values of H(2) is (3R)/(...

    Text Solution

    |