Home
Class 12
CHEMISTRY
At 100^@C , the vapour pressure of a sol...

At `100^@C` , the vapour pressure of a solution of 6.5 g of solute in 100 g of water is 732 mm. If `k_b` is 0.52 klm, the boiling point of solution will be:

A

380.4 K

B

376.2 K

C

373.5 K

D

354.7 K

Text Solution

Verified by Experts

The correct Answer is:
B
Hint: `X_("water")=0.9`
`X_("ethanol")=0.1`
`DeltaT_b=k_bxxm=0.52xx0.1 xx(1000)/(0.9xx18)=3.2K`
`T_b = 373+3.2 = 376.2 K`
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    ACCURATE PUBLICATION|Exercise 1 MARK QUESTION |40 Videos

  • SOLUTIONS

    ACCURATE PUBLICATION|Exercise 3 MARK QUESTION |23 Videos

  • P-BLOCK ELEMENTS

    ACCURATE PUBLICATION|Exercise P-BLOCK ELEMENTS GROUP-18 (NOBLE GASES )(2 OR 5 MARK QUESTIONS)|17 Videos

  • SOLVED SAMPLE PAPER, MARCH - 2021

    ACCURATE PUBLICATION|Exercise SECTION -D |16 Videos

Similar Questions

Explore conceptually related problems

The vapour pressure of water at 293K is 0.0231 bar and the vapour pressure of a solution of 108.24 g of a compound in 1000 g of water at the same temperature is 0.0228 bar. Calculate the molar mass of the solute.

The vapour pressure of an aqueous solution of glucose is 750 mm of mercury at 100^@ C . Mole fraction of solute will be

The vapour pressure of pure liquid A at 310^@C is 0.158bar. The vapour pressure of this liquid in solution with liquid B is 0.095 bar. Calculate the mole fraction of A in the solution if the mixture obeys Raoult's law.

The lquid A and B from ideal solutions. At 300 K, the vapour pressure of solution containing 1 mole of A and 3 mole of B is 550 mm Hg. At the same tempreature, if one more mole of B is added to this solution, the vapour pressure of the solution increases by 10 mm Hg. determinethe vapour pressure of A and B in their pure states (in mm Hg):

If the elevation in boiling point of a solution of 10 gm of solute (mol. Wt. = 100) in 100 gm of water is DeltaT_(b) , the ebullioscopic constant of water is

At 48^(@)C , the vapour pressure of pure CS_(2) is 850torr . A solution of 2.0 g of sulphur in 100g of CS_(2) has a vapour pressure 844.9 torr. Determine the atomicity of sulphur molecule :

Vapour pressure of dilute aq. solution of glucose is 750 mm of Hg at 373 K. The mole fraction of the solute is ( p^@ water = 760 mm of Hg)

At 20^@C the vapour pressure of pure liquid A is 22 mm Hg and that of pure liquid B is 75mm Hg. What is the composition of the solutions of these two components that has a vapour pressure of 48.5 mm Hg at this temperature?

At 25^@C the vapour pressure of pure water is 23.76 mm of Hg and that of an aqueous dilute solution of urea is 22.98 mm of Hg. Calculate the molality of the solution.

ACCURATE PUBLICATION-SOLUTIONS -NUMERICAL QUESTIONS (3 MARKS)
  1. At 100^@C , the vapour pressure of a solution of 6.5 g of solute in 10...

    Text Solution

    |

  2. Commercially available sample of sulphuric acid is 15% H2SO4 by weight...

    Text Solution

    |

  3. Concentrated H(2)SO(4) has a density 1 . 9 g/mL and is 99% H(2) SO(4)...

    Text Solution

    |

  4. Calculate the mass of a non-volatile solute (molar mass 40 g mol^(-1))...

    Text Solution

    |

  5. 18 g of glucose is dissolved in 1 kg of water. At what temperature wil...

    Text Solution

    |

  6. How many grams of ethylene glycol (molar mass = 62) should be added to...

    Text Solution

    |

  7. Benzene and toluene form nearly ideal solution . At 313 K the vapou...

    Text Solution

    |

  8. At 298 K the vapour pressure of pure benzene C(6) H(6) is 0.256 bar...

    Text Solution

    |

  9. 200 cm^3 of an aqueous solution of a protein contains 1.26g of the pro...

    Text Solution

    |

  10. 4 . 0 g of NaOH are contained in one decilitre of a solution. Calcula...

    Text Solution

    |

  11. In winter, the normal temperature in Dharmshala is - 8^(@) C Is a 30%...

    Text Solution

    |

  12. Calculate mole fraction of ethanol and water in a sample of rectified ...

    Text Solution

    |

  13. 19.5 g of CH2FCOOH is dissolved in 500 g of water. The depression in t...

    Text Solution

    |

  14. 4 . 0 g of NaOH are contained in one decilitre of a solution. Calcula...

    Text Solution

    |

  15. At some temperature the vapour pressure of pure benzene, C(6) H(6) is ...

    Text Solution

    |

  16. Vapour pressure of chlolfom (CHCI(3)) and dichloromethane (CH(2) CI(2...

    Text Solution

    |

  17. The density of 10% by mass of KCI solution in water is 1 . 0 6 g mL^...

    Text Solution

    |

  18. The vapour pressure of ethanol (C(6)H(5) OH) and methanol (CH(3) OH)...

    Text Solution

    |

  19. Addition of 0.643g of a compound to 43.95g of benzene lowers the freez...

    Text Solution

    |

  20. 18 g of a compound is dissolved in 10 kg of water so that the resu...

    Text Solution

    |

  21. 35 g of compound is added in 1 kg of water so that the resulting sol...

    Text Solution

    |