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12th Class Chemistry Sample Paper Chemistry Sample Test Paper-5

  • question_answer
       Copper crystallises with face centred cubic unit cell. If the radius of copper atom is 127.8 pm, calculate the density of copper metal. (Atomic mass of Cu = 63.55 u and Avogadro's number )   [3] Or Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron is 7.87 g . Use this information to calculate Avogadro's number. (Atomic mass of Fe = 56.0 u)                                            [3]

    Answer:

    In fcc structure Z = 4                                                                                                                                                                                                                                      [1]


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