Wednesday 10 April 2013

Q15 Copper crystallises into a fcc lattice with edge length 3.61 × 10–8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm–3.

Q15 Copper crystallises into a fcc lattice with edge length 3.61 × 10–8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm–3.

Solution :–
Given that
Length of edge, a = 3.61x10–8 cm
Atomic mass of cupper, M = 63.55 g/mol
Avogadro constant, NA  = 6.022x1023 per mol
Number of atoms in unit cell of FCC, Z= 4
Use formula of density 
Plug the values in this formula we get 

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8 comments:

  1. Radhika 16 March 2018 at 21:32

    Atomic mass of copper not given in the question.

    ReplyDelete
    Replies
    1. Unknown27 June 2018 at 03:59

      Atomic massbfor cu will not change it will be the same

      Delete
    2. Unknown1 July 2018 at 07:53

      Yaara baby

      Delete
    3. Passionate Prem13 November 2018 at 07:44

      You have to remember that atomic mass of Cu is 63.55 g

      Delete
    4. Unknown25 February 2019 at 20:33

      Actually it is molar mass not atomic.

      Delete
  2. Unknown9 August 2018 at 09:58

    This comment has been removed by the author.

    ReplyDelete
  3. Unknown16 December 2018 at 05:02

    Why atomic mass is not given shall we have to remember it

    ReplyDelete
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