Home
Class 12
CHEMISTRY
Calculate the boiling point of a solutio...

Calculate the boiling point of a solution made by dissolving 38.5 g of a solute of molecular weight 154 in 250 g of benzene if boiling point of pure benzene is `80.1^@C and K_b` for benzene is `2.61^@C m^(-1)`

A

`85.32^@C`

B

`74.88^@C`

C

`77.49^@C`

D

`82.71^@C`

Text Solution

Verified by Experts

The correct Answer is:
D
Molality of solvent =`(38.5)/154 xx 1000/250 = 1`
`DeltaT_b = K_b.m = 2.61xx1 = 2.61^@C`
`DeltaT_b = T_b-T_b^@`
`T_b = DeltaT_b + T_b^@ = 2.61+80.1 = 82.71^@C`
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    MTG GUIDE|Exercise CHECK YOUR NEET VITALS|25 Videos

  • SOLUTIONS

    MTG GUIDE|Exercise AIPMT/NEET MCQs|23 Videos

  • SOLUTIONS

    MTG GUIDE|Exercise AIPMT/NEET MCQs|23 Videos

  • SOLID STATE

    MTG GUIDE|Exercise AIPMT/NEET MCQS |17 Videos

  • SURFACE CHEMISTRY

    MTG GUIDE|Exercise AIMPT/NEET MCQS|11 Videos

Similar Questions

Explore conceptually related problems

The boiling point of a solution made by dissolving 12.0 g of glucose in 100 g of water is 100.34^(@)C . Calculate the molecular weight of glucose, K_(b) for water = 0.52^(@)C//m .

A solution containing 0.1g of a non-volatile organic substance P (molecular mass 100) in 100g of benzene raises the boiling point of benzene by 0.2^(@)C , while a solution containing 0.1 g of another non-volatile substance Q in the same amount of benzene raises the boiling point of benzene by 0.4^(@)C . What is the ratio of molecular masses of P and Q ?

Calculate molal elevation constant for a solution containing 1.5 g solute dissolved in 250g g solvent,having elevation of boiling point 0.01. [ molecular wt. = 60]

when 1.80 g of a nonvolatile solute is dissolved in 90 g of benzene, the boiling point is raised to 354.11K . If the boiling point of benzene is 353.23K and K_(b) for benzene is 2.53 KKg mol^(-1) , calculate the molecular mass of the solute. Strategy: From the boiling point of the solution, calculate the boiling point elevation, DeltaT_(b) , then solve the equation DeltaT_(b)=K_(b)m for the molality m . Molality equals moles of solute divided by kilograms of solvent (benzene). By substituting values for molality and kilograms C_(6)H_(6) , we can solve for moles of solute. The molar mass of solute equals mass of solute (1.80 g) divided by moles of solute. The molecular mass (in amu) has the same numerical value as molar mass in g mol^(-1) .

Phenol associates in benzene to from dimer (C_(6)H_(5)OH)_(2) . The freezing point of a solution containing 5g of phenol in 250 g of benzene is lowered by 0.70^(@)C . Calculate the degree of association of phenol in benzene .( k_(f) for benzene = 5.12 Km^(-1) )

MTG GUIDE-SOLUTIONS -NEET CAFE (TOPICWISE PRACTICE QUESTIONS)
  1. Calculate the weight of ethylene glycol (an effective antifreeze) that...

    Text Solution

    |

  2. Calculate the osmotic pressure at temperature 37^@C of an aqueous solu...

    Text Solution

    |

  3. Calculate the boiling point of a solution made by dissolving 38.5 g of...

    Text Solution

    |

  4. A solution containing 0.5216 g of naphthalene (molecular weight = 128....

    Text Solution

    |

  5. Calculate the freezing point of a solution of urea in water which boil...

    Text Solution

    |

  6. The percentage dissociation of a 0.011 m aqueous solution of K3[Fe(CN)...

    Text Solution

    |

  7. Calculate the osmotic pressure at 0^@C of a 0.18 m aqueous solution of...

    Text Solution

    |

  8. The freezing point of solution made by dissolving 1.1 g of CoCl2.6NH3 ...

    Text Solution

    |

  9. The osmotic pressure of solution increases if

    Text Solution

    |

  10. An aqueous solution containing 1 g of urea boils at 100.25 °C. The aqu...

    Text Solution

    |

  11. The osmotic pressure of 5% (mass/volume) solution of cane sugar at 150...

    Text Solution

    |

  12. Which of the following method is used for measuring the osmotic pressu...

    Text Solution

    |

  13. The normal boiling point of water is 373 K (at 760 mm). Vapour pressur...

    Text Solution

    |

  14. 1.8 g of fructose (C6H(12)O6) is added to 2 kg of water. The freezing ...

    Text Solution

    |

  15. For determination of molar mass of colloids, polymers and protein whic...

    Text Solution

    |

  16. Molal depression constant is calculated from the enthalpy of fusion (4...

    Text Solution

    |

  17. The average osmotic pressure of human blood is 7.8 bar at 27^@C. What ...

    Text Solution

    |

  18. Camphor is often used in molecular mass determination because

    Text Solution

    |

  19. A non-volatile electrolyte dissolved in an aqueous solution in same mo...

    Text Solution

    |

  20. A 0.5 molal solution of ethylene glycol in water is used as coolant in...

    Text Solution

    |