iPad 7:37 PM F 65% digital.wwnorton.com h Illinois State University: CHE 140 001
ID: 525142 • Letter: I
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iPad 7:37 PM F 65% digital.wwnorton.com h Illinois State University: CHE 140 001 SP2017 General Ch. Smartworks sam@ilstu edu 05/05/17 Oi This is a Mixed question/ltis worth 2 points You have unlimited attempts/There is no attempt penalty See page 578 16 Question points) The 1987 Nobel Prize in Physics was awarded to J. G. Bednorz and K. A. Muller for their discovery of superconducting ceramic materials such as YBa2Cu307.The figure here shows the unit cell of another yttrium-barium-copper oxide. 1st attempt See Periodic Table See Hint Part 1 (1 pt) Match the atoms with the type of unit cell position. 16 SUBM /20Explanation / Answer
1. Cu is at corners
O is at edge center
Ba and Y is at body center
2. Cu = (1/8) x 16 = 2
O = (1/4) x 24 = 6
Y = 1x1=1
Ba = 2 x 1=2
Hence, the required formula of the compound is 'Ba2YCu2O6'
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