Home
Class 11
CHEMISTRY
Molar heat capacity of CD(2)O (deuterate...

Molar heat capacity of `CD_(2)O` (deuterated form of formaldehyde) at constant pressure in `9 cal mol^(-1) K^(-1) at 1000K`. Calculate the entropy change associated with cooling of `3.2 g` of `CD_(2)O` vapour from `1000 to 900K`.

Text Solution

Verified by Experts

`DeltaH` for cooling `CD_(2)O = mS DeltaT = (3.2)/(32) xx 9 xx 100 = 90 cal`
Therefore, cooling is exothermic, `DeltaH =- 90 cal`
Now, `DeltaS = (DeltaH)/(T) = - (90)/(900) =- 0.1 cal deg^(-1)`
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

4.0 g of helium occupies 22400 cm^(3) at STP. The specific heat capacity of helium at constant pressure is ( 5.0 cal K^(-1) mol ^(-1)) . Calculate the speed of sound in helium at STP.

The molar heat capacity of a gas at constant volume is found to be 5 cal mol^(-1) K^(-1) . Find the ratio gamma = C_p/C_v for the gas. The gas constant R=2 cal mol^(-1) K^(-1).

The heat of combustion of H_(2)(g) at constant pressure and 300k is -280kJ mol^(-1) . What will be the heat of combustion at constant volume and at 300K ?

The density of an equilibrium mixture of N_(2)O_(4) and NO_(2) at 1 atm is 3.62 g L^(-1) at 288 K and 1.84 g L^(-1) at 348 K . Calculate the entropy change during the reaction at 348 K .

The specific heat capacities of hydrogen at constant volume and at constant pressure are 2.4 cal g^(-1)K ^(-1) and 3.4 cal g^(-1) K^(-1) respectively. The molecular weight of hydrogen is 2g mol^(-1) and the gas constant R= 8.3 xx 10^(7)erg K^(-1) mol^(-1) . Calculate the value of J .

The molar specific heats of an ideal gas at constant volume and constant pressure are respectively 4.98 and 6.96 cal mol^(-1) K^(-1) . If the molecular weight of the gas be 32, then calculate the root means square speed of the molecule of the gas at 120^@ C . (1 cal = 4.2 J)

Calculate the specific heat capacities at constant volume and constant pressure for CO (2), Given gamma = 1.30, R =8.33 J mol ^(-1) K ^(-1).

What is r.m.s speed of O_(2) molecule if its kinetic energy is 2 k cal "mol"^(-1) ?

The molar internal energy of a gas over a temperature range is expressed as: U_(m) (T) =a +bT +cT^(2) , where b = 16 J mol^(-1)K^(-1) and c = 6 xx 10^(-3) J mol^(-1)K^(-2) . Find: a. C_(V,m)at 300K b. The entropy change when 1 mol of a gas is heated from 300K to 600K at constant volume.

The free energy for a reaction having DeltaH=31400 cal, DeltaS=32" cal "K^(-1)mol^(-1) at 1000^(@)C is:

CENGAGE CHEMISTRY ENGLISH-THERMODYNAMICS-Archives (Subjective)
  1. Molar heat capacity of CD(2)O (deuterated form of formaldehyde) at con...

    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

    |