Home
Class 12
CHEMISTRY
Two elements A and B form compounds havi...

Two elements A and B form compounds having formula `AB_2` and `AB_4`. When dissolved in 20 g of benzene `(C_6H_6)`, 1 g of `AB_2` lowers the freezing point by 2.3 K whereas 1.0 g of `AB_4` lowers it by 1.3 K. The molar depression constant for benzene is `5.1 K kg mol^-1`. Calculate atomic masses of A and B.

Promotional Banner

Topper's Solved these Questions

  • Solid State

    ASSAM ACADEMIC CENTRE|Exercise Example |166 Videos

  • SURFACE CHEMISTRY

    ASSAM ACADEMIC CENTRE|Exercise Example|321 Videos

Similar Questions

Explore conceptually related problems

1.0 g of a nonelectrolyte solute dissolved in 50g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol. Find the molar mass of the solute.

Calculate the mass of compound ( molar mass = 256 g mol^(-1) ) to be dissolved in 75 g of benzene to lower its freezing point by 0.48 K (Kf= 5.12 K kg mol^(-1)) .

2g of a non-electrolyte solute dissolved in 100g of benzene lowered the freezing point of benzene by 0.40 K. find the molar mass of the solute.

What mass of NaCl (molar mass= 58.5g mol^-1) must be dissolved in 65g of water to lower the freezing point by 7.5^@C ? The freezing point depression constant, K_f for water is 1.86 K kg mol^-1 . Assume vant Hoff factor for NaCl is 1.87.

A 0.561 m solution of an unknown electrolyte depresses the freezing point of water by 2.93^@C . What is Vant Hoff factor for this electrolyte? The freezing point depression constant (K_f) for water is 1.86^@C Kg mol^-1 .

A solution of sucrose (molecular mass 342 u) is prepared by dissolving 0.84 g in 100g of water at 298K. Calculate the freezing point of water in the solution. (K_f for water = 1.86 K kg mol^-1)

2000 cm^3 of an aqueous solution of a protein contains 1.26 g of the protein. The osmotic pressure of such a solution at 300K is found to be 2.57 … 10^(-3) bar. Calculate the molar mass of the protein.

Calculate the mass of ascorbic acid (Vitamin C, C_6H_8O_6) to be dissolved in 75g of acetic acid to lower its melting point by 1.5^@C . K_f = 3.9 K kg mol^-1

Calculate the depression in the freezing point of water when 10 g of CH_3CH_2CHClCOOH is added to 250 g of water. K_a = 1.4xx10^-3 , K_f = 1.86 K kg mol^-1 .

On dissolving 19.5g CH_2F COOH in 500g of water, a depression of 1^@C in freezing point of water is observed. Calculate the vant Hoff factor and dissociation constant of Fluoroacetic acid. (Given, K_f = 1.86 K kg mol^-1)

ASSAM ACADEMIC CENTRE-Solutions-Example
  1. A solution containing 30g of non-volatile solute exactly in 90g of wat...

    Text Solution

    |

  2. A 5% solution (by mass) of canesugar in water has freezing point of 27...

    Text Solution

    |

  3. Two elements A and B form compounds having formula AB2 and AB4. When d...

    Text Solution

    |

  4. At 300 K, 36 g of glucose present in a litre of its solution has an os...

    Text Solution

    |

  5. Suggest the most important type of intermolecular interaction in the f...

    Text Solution

    |

  6. Suggest the most important type of intermolecular attractive interacti...

    Text Solution

    |

  7. Suggest the most important type of intermolecular interaction in the f...

    Text Solution

    |

  8. Suggest the most important type of intermolecular attractive interacti...

    Text Solution

    |

  9. Suggest the most important type of intermolecular attractive interacti...

    Text Solution

    |

  10. Based on solute-solvent interactions, arrange the following in order o...

    Text Solution

    |

  11. Among the following compounds, identify which are insoluble, partially...

    Text Solution

    |

  12. Among the following compounds, identify which are insoluble, partially...

    Text Solution

    |

  13. Among the following compounds, identify which are insoluble, partially...

    Text Solution

    |

  14. Among the following compounds, identify which are insoluble, partially...

    Text Solution

    |

  15. Among the following compounds, identify which are insoluble, partially...

    Text Solution

    |

  16. If the density of some lake water is 1.25 g mL^-1 and contains 92 g of...

    Text Solution

    |

  17. If the solubility product of CuS is 6xx10^-16, calculate the maximum m...

    Text Solution

    |

  18. Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3...

    Text Solution

    |

  19. Nalorphene (C19H21NO3), similar to morphine, is used to combat withdra...

    Text Solution

    |

  20. Calculate the amount of benzoic acid (C6H5COOH) required for preparing...

    Text Solution

    |