Home
Class 12
CHEMISTRY
How many unit cell are present in 4.0 gm...

How many unit cell are present in 4.0 gm of crystal AB (formula mass of AB = 40) having rock salt type structure ? (`N_(A)` = Avogadro's no.) 

A

`N_(A)`

B

`(N_(A))/(10)`

C

`40N_(A)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
`40 rarr N, 4 to ?, 1` unit cell `to 4 NaCl` pair
`1Nrarr4xx40,?larr4" "(4)/(4xx40)N" (or)"`
`"1 unit cell"rarr4xx40xx1.66xx10^(-24)gm ?larr"4 gm"(4)/(4xx40xx1.66xx10^(-24))=(1)/(40)N`
Promotional Banner

Topper's Solved these Questions

  • SOLID STATE

    AAKASH SERIES|Exercise PRACTICE SHEET - 3|30 Videos

  • SOLID STATE

    AAKASH SERIES|Exercise PRACTICE SHEET - 4|30 Videos

  • SOLID STATE

    AAKASH SERIES|Exercise PRACTICE SHEET - 1|30 Videos

  • REVISION EXERCISE

    AAKASH SERIES|Exercise COMPLEX COMPOUNDS|47 Videos

  • SOLIDS STATE

    AAKASH SERIES|Exercise PRACTICE EXERCISE|63 Videos

Similar Questions

Explore conceptually related problems

How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1g ? (atomic masses : Na = 23, CI=35.5)

The number of unit cells present in 39g of potassium if it crystallizes as body centred cube is (N = Avogadro number, At. wt. of potassium = 39)

Density of a unit cell is represented as rho=("Effectiveno.ofatom(s)x Mass of a unit cell")/("Volume of a unit cell")=(Z.M.)/(N_(A).a^(3)) Where, mass of unit cell = mass of effective no. of atom(s) or ion(s). M = At. wt./formula wt. N_(A)="Avogadro’s no. "rArr 6.023xx10^(23) a = edge length of unit cell Silver crystallizes in a foc lattice and has a density of 10.6g//cm^(3) ? What is the length of an edge of the unit cell?

Density of a unit cell is represented as rho=("Effectiveno.ofatom(s)x Mass of a unit cell")/("Volume of a unit cell")=(Z.M.)/(N_(A).a^(3)) Where, mass of unit cell = mass of effective no. of atom(s) or ion(s). M = At. wt./formula wt. N_(A)="Avogadro’s no. "rArr 6.023xx10^(23) a = edge length of unit cell An element crystallizes in a structure having foc unit cell of an edge 200 pm. Calculate the density,if 100g this element contains 12 xx 10^(23) atoms :

The number of unit cells present in a cubic shaped ideal crystal of NaCl of mass 0.4gr is x xx 10^(21) , then 'x' is ________

How many sub-shells are associated with n=4 ? How many electrons will be present in the sub-shell having ms value of -1/2 for n=4 ?

4.4 grams of carbondioxide present in a vessel at certain temperature exerts a pressure of 1000 kPa. Keeping the temperature constant if the gas is evacuated to have a rediual pressure of 0.01 kPa,how many molecules are left in the vessel ?

Out of seven crystal systems how many have body centred unit cell ?

AAKASH SERIES-SOLID STATE-PRACTICE SHEET - 2
  1. In a planar tetraatomic molecule, AB(3), A is at the centroid of the e...

    Text Solution

    |

  2. The distance between the two tetrahedral voids (along the body diagona...

    Text Solution

    |

  3. How many unit cell are present in 4.0 gm of crystal AB (formula mass o...

    Text Solution

    |

  4. Which of the following statement(s) is (are) correct for CaF(2),

    Text Solution

    |

  5. Which of the following informations are correct about CsCl?

    Text Solution

    |

  6. Select the correct statements

    Text Solution

    |

  7. Which of the follwing expression is correct for packing fraction of Na...

    Text Solution

    |

  8. Ferrous oxide has a cubic structure and eged length of the unit cell i...

    Text Solution

    |

  9. Cdo has NaCl structure with density 8.27 g/cc. If the ionic radius of ...

    Text Solution

    |

  10. O^(-2): "CCP" B^(3+) : "Half of octahedral Voids" A^(2+) : 1//8^("...

    Text Solution

    |

  11. O^(-2): "CCP" B^(3+) : "Half of octahedral Voids" A^(2+) : 1//8^("...

    Text Solution

    |

  12. O^(-2): "CCP" B^(3+) : "Half of octahedral Voids" A^(2+) : 1//8^("...

    Text Solution

    |

  13. Density of a unit cell is represented as rho=("Effectiveno.ofatom(s)...

    Text Solution

    |

  14. Density of a unit cell is represented as rho=("Effectiveno.ofatom(s)...

    Text Solution

    |

  15. {:("COLUMN - I","COLUMN - II"),(,"(A - cation) (B - anion)"),("A Rock ...

    Text Solution

    |

  16. {:("COLUMN - I","COLUMN - II"),("A) Co - ordination no. of "Sr^(2+) an...

    Text Solution

    |

  17. An element assumes a cubical structure in which only 32% of the space ...

    Text Solution

    |

  18. "Molar mass of solid = 259.8 g mol"(-1) A solid crystallises in hexa...

    Text Solution

    |

  19. A cubic solid is made up of two elements P and Q. Atoms of Q are prese...

    Text Solution

    |

  20. The face diagonal length of fcc cubic cell of NaCl type ionic crystal ...

    Text Solution

    |