Home
Class 11
CHEMISTRY
A 250 W electric heater raised the tempe...

A 250 W electric heater raised the temperature of a calorimeter by `4.22^(@)C` in 55s. When the oxidation of a methanol sample was carried out in the same calorimeter, the temperature rose from `22.49^(@)C` to `26.77^(@)C`. Then

A

The amount of heat supplied by the electric heater is 13.75 kJ

B

The amount of heat supplied by the electric heater is 4.6 kJ

C

The enthalpy of change for the oxidation is 1.39 kJ

D

The enthalpy of change for the oxidation is 13.9 kJ

Text Solution

Verified by Experts

The correct Answer is:
A
Heat supplied by electric heater is `= 250J//sec xx 55sec = 13.75 kJ`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    NARAYNA|Exercise Level-VI|150 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Passages|13 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Level-II (H.W)|24 Videos

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - IV EXEMPLAR PROBLEMS|24 Videos

Similar Questions

Explore conceptually related problems

By what factor the rms velocity will change, if the temperature s raised from 27^(@)C to 327^(@)C ?

The heat capacity of a bomb calorimeter is 500J//^@C. When 0.1 g of a methane was burnt in this calorimeter, the temperature rose by 2^@C . The value of DeltaE per mole will be

How long does a 59 kw water heater take to raise the temperature of 150L of water from 21^(@)C to 38^(@)C (in min)

An electric heater rated as (500 W and 200 V) raises the temperature of 1 kg water from 15^(@)C to its boiling point in 15 min. the heat effeciency of the heater is

At 25^(@)C , buring 0.2 "mole" H_(2) with 0.1 mole O_(2) to produce H_(2)O(l) in a bomb calorimeter (constant volume) raises the temperature of the apperaturs 0.88^(@)C . When 0.01mol toulene is burned in this calorimeter, the temperature is raised by 0.615^(@)C . Calculate DeltaH^(Theta) combustion of toluene. Delta_(f)H^(Theta) H_(2)O(l) =- 286 kJ mol^(-1) .

An electric heater of power 100 W raises the temperature of 5 kg of a liquid from 25^(@)C to 31^(@)C in 2 minutes. Calculate the specific heat of the liquid.

An electric heater has coil resistance of 12 Omega and is operated from 220 V power line. If no heat escapes from it then how much time is required to raise the temperature of 40 kg of water from 10^(@)C to 80^(@)C ?

A system S receives heat continuously from an electric heater of power 10 W . The temperature of S becomes constant at 50^(@)C when the surrounding temperature is 20^(@)C . After the heater is switched off, S cools from 35.1^(@)C to 34.9^(@)C in 1 minute . the heat capacity of S is

A calorimeter containes 50g of water at 50^(@)C . The temperature falls to 45^(@)C in 10 minutes. When the calorimeter contains 100g of water at 50^(@)C it takes 18 minutes for the temperature to become 45^(@)C . Find the water equivalent of the calorimeter.

NARAYNA-THERMODYNAMICS-Level -V
  1. The vapour pressure of solid benzoic acid has been found to obey the r...

    Text Solution

    |

  2. Select the incorrect statements about the plots of ln K vs 1/T

    Text Solution

    |

  3. A 250 W electric heater raised the temperature of a calorimeter by 4....

    Text Solution

    |

  4. Choose the correct statements:

    Text Solution

    |

  5. 200g of water is contained in a beaker of mass 150 f at 20^(@)C. The t...

    Text Solution

    |

  6. Which one is not correct for a cyclic process as shown in the figure ?

    Text Solution

    |

  7. Select the incorrect statements for the equillibrium under standard co...

    Text Solution

    |

  8. Given, 2Fe2O(3(s)) to 4Fe((s)) + 3 O(2(g)), Deltar G1^@ = +1487kJmol^(...

    Text Solution

    |

  9. Which of the following is correct for the change shown below ? under...

    Text Solution

    |

  10. Which of the following graphs given below show (s) adiabatic process?

    Text Solution

    |

  11. He,N(2), and O(3) are expanded adiabatically and their expansion curve...

    Text Solution

    |

  12. Heat of neutralisation of strong acid and strong base under 1 atm and ...

    Text Solution

    |

  13. One mole of CH(3)COOH undergo dimerization in vapour state at 127^(@)C...

    Text Solution

    |

  14. Work done in expansion of an idela gas from 4L to 6L against a constan...

    Text Solution

    |

  15. What work is to be done on 2mol of a perfect gas at 27^(@)C it is comp...

    Text Solution

    |

  16. If one mole of an ideal gas with C(v) = (3)/(2) R is heated at a const...

    Text Solution

    |

  17. One mole of an ideal gas is subjected to a two step reversible process...

    Text Solution

    |

  18. The normal boiling point of a liquid X is 400 K. Which of the fol...

    Text Solution

    |

  19. From the following data, mark the option (s) where Delta H is correctl...

    Text Solution

    |

  20. The bond dissociation energy of a diatomic molecule is also called bon...

    Text Solution

    |