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The Solid State — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State3 Marks
Question
A crystalline solid has a cubic structure in which tungsten $(W)$ atoms are located at cube corners of the unit cell, oxygen atoms at the cube edges and sodium atom at the centre. What is the molecular formula of the compound?
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Answer

Number of W atoms per unit cell $= 8($at the corners$) \times\frac{1}{8}=1$
Number of O atoms per unit cell $= 12($at the edge centres$) \times\frac{1}{4}=3$
Number of sodium atoms per unit cell $= 1($at the cube centre$) × 1 = 1,$
Nence, the formula of the compound $= NaWO_3.$

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