Shristy posted an Question
August 14, 2020 • 02:30 am 30 points
  • IIT JAM
  • Chemistry (CY)

(c) a * b#c, a =y = 90°. b # 90° 25. (d) a =b#c, a = b =y a compound alloy cu3au crystallizes in a cubic lattice with cu at the face centers and au at the corne

(C) a * b#c, a =y = 90°. B # 90° 25. (d) a =b#c, a = B =Y A compound alloy Cu3Au crystallizes in a cubic lattice with Cu at the face centers and Au at the corners. How many formula units of the compound are there in each unit cell? (a) 4 (b) 3 (c) 2 (d) I

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  • Suman Kumar

    See in one unit cell calcium occupy face centre so 3 atom of calcium & Au occupy corner so it's contribution is 1.

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    Now your formula is also AuCa3. So 1 formula unit is present

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    bt according to ques it occurs in FCC so z=4 ??

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    Z is total no of atom. So 3 atom of calcium & 1 atom of Au

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    so mam what is formula unit

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    See this similar question

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    Ca3Au

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    which ques ?

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    In you tube video

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    https://youtu.be/qB_rccE0OUY

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    please mark thankyou 🙏 Shristy

  • comment-profile-img>
    Dinesh khalmaniya 1 Best Answer

    check it

    cropped23653851973809220.jpg
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    bt according to ques it occurs in FCC so z=4 ??

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    got it??

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    yes in FCC 4 atoms/unit cell so we take z =4

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    bt ans given is 1

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    yes, ans is one

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    check the Sol sent by me

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    option D is correct

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    what is formula unit ?

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    formula unit mean simply how many units of ionic solids are present in a unit cell

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    here one formula unit of Cu3Au mean only one unit of Cu3Au present in unit cell mean z =1

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    got it?

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