Home
Class 12
CHEMISTRY
Acetone boils at 56.38^(@)C and a soluti...

Acetone boils at `56.38^(@)`C and a solution of 1.41 g of an organic compound in 20 g of acetone boils at `56.88^(@)`C. Calculate the molar mass of the organic compound (Given `k_(b)` for acetone = 1.67 k kg/ mol).

Text Solution

Verified by Experts

`Delta T_(b) = K_(b) xx ` Molality
`Delta T_(b) = k_(b) xx (("mass of solute/molecular mass")xx 1000)/("mass of solvent")`
`(56.88 - 56.38) = (1.67 xx (1.41// "Msolute") xx 1000)/(20)`
Mass of solute (M) = 235.47
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    OSWAAL PUBLICATION|Exercise TOPIC - 3 COLLIGATIVE PROPERTIES , DETERMINATION OF MOLAR MASS, ABNORMAL MOLAR MASS, VAN.T HOFF FACTOR (LONG ANSWER TYPE QUESTIONS - II)|18 Videos
  • SOLUTIONS

    OSWAAL PUBLICATION|Exercise TOPIC - 3 COLLIGATIVE PROPERTIES , DETERMINATION OF MOLAR MASS, ABNORMAL MOLAR MASS, VAN.T HOFF FACTOR (SHORT ANSWER TYPE QUESTIONS)|11 Videos
  • SOLID STATE

    OSWAAL PUBLICATION|Exercise TOPIC -2 (SHORT ANSWER TYPE QUESTIONS)|21 Videos
  • Solved Paper

    OSWAAL PUBLICATION|Exercise Exercise|60 Videos

Similar Questions

Explore conceptually related problems

(a) Acetone boils at 56.38^@C and a solution of 1.41g of an organic compound in 20 g of acetone boils at 56.88^@C . Calculate the molar mass of the organic compound (Given K_(b) for acetone =1.67 K kg//mol ). (b) What is reverse Osmosis?Mention one important application of it.

Chloroform boils at 61.7^(@)C and the solution of 6.21g of an organic compound is dissolved in 24g of chloroform boils at 68.04^(@)C . What would be the molar mass of compound if K_(b) value is 3.63 K kg mol^(-1) .

A solute containing 0.564g of solute in 36.8g of acetone boils at 56.46^(@)C . Calculate the molar mass of solute if the boiling point of acetone is 56.30^(@)C . [ K_(b) for acetone 1.92K kg. mol^(-1) ]

0.12 g of an organic compound gave on combustion 0.18 g of water and 0.11 g of CO_(2) . Calculate the percentage of C and H in the organic compound.

The solution containing 10 g of an organic compound per litre showed an osmotic pressure of 1.18 atm at 0^(@)C . Calculate the molecular mass of the compound "(R=0.0821 litre atm per degree per mol)"

A solution containg 12 g of a non-electrolyte substance in 52 g of water gave boiling point elevation of 0.40 K . Calculate the molar mass of the substance. (K_(b) for water = 0.52 K kg mol^(-1))

A solution containing 12.5 g of non-electrolyte solution in 175g of water gave a boiling point elevation of 0.7 k. calculate the molar mass of the solute if K_(b) for water is 0.52 K kg mol^(-1) .

By dissolving 13.6 g of a substance in 20 g of water, the freezing point decreased by 3.7^(@)C . Calculate the molecular mass of the substance. (Molal depression constant for water = 1.863K kg mol^(-1))

The freezing point of a solution containing 4.8 g of a compound in 60 g of benzene is 4.48. What is the molar mass of the compound ? ( K_(f)=5.1 Km^(-1) , freezing point of benzene =5.5^(@)C )

The boiling point of benzene is 353.23 K . When 1.80 g of a non-volatile solute was dissolved in 90 g benzene, the boiling point is raised to 354.11 K . Calculate the molar mass of the solute. ( K_(b) for benzene is 2.53 K kg mol^(-1) )

OSWAAL PUBLICATION-SOLUTIONS-TOPIC - 3 COLLIGATIVE PROPERTIES , DETERMINATION OF MOLAR MASS, ABNORMAL MOLAR MASS, VAN.T HOFF FACTOR (LONG ANSWER TYPE QUESTIONS - I)
  1. The boiling point of benzene is 353.23 K when 1.80 g of a non-volatile...

    Text Solution

    |

  2. Acetone boils at 56.38^(@)C and a solution of 1.41 g of an organic com...

    Text Solution

    |

  3. Calculate the osmotic pressure of 0.05% urea solution in water at 20^(...

    Text Solution

    |

  4. A solution containing 18g of non - volatile non - electrolyte solute i...

    Text Solution

    |

  5. On dissolving 2.34g of non-electrolyte solute in 40g of benzene, the b...

    Text Solution

    |

  6. Determine the osmotic pressure of a solution prepa.red by diHolving 2....

    Text Solution

    |

  7. 1.0 g of non - electrolyte solute dissolved in 50 g of benzene lowered...

    Text Solution

    |

  8. A solution of glycerol (C(3) H(8) O(3)) in water was prepared by disso...

    Text Solution

    |

  9. Calculate the amount of KCl which must be added to 1 kg of water so th...

    Text Solution

    |

  10. At 25^(@)C , the saturated vapour pressure of water is 3.165 k Pa (23....

    Text Solution

    |

  11. Calculate the freezing point of an aqueous solution containing 10.50 g...

    Text Solution

    |

  12. What mass of ethylene glycol (molar mass = 62.0 g mol^(-1) ) must be a...

    Text Solution

    |

  13. 15 g of an unknown molecular substance was dissolved in 450 g of water...

    Text Solution

    |

  14. Vapour pressure of chloroform (CHCl(3)) and dichloromethane (CH(2) Cl(...

    Text Solution

    |

  15. At a given temperature and pressure nitrogen gas is more soluble in wa...

    Text Solution

    |

  16. Match the following if molecular masses of X, Y, Z are same

    Text Solution

    |

  17. At 10^(@) C, the average osmotic pressure of blood is 8.8 atm. Find th...

    Text Solution

    |