Join now for JEE/NEET and also prepare for Boards Join now for JEE/NEET and also prepare for Boards. Register Now
Hey there! We receieved your request
Stay Tuned as we are going to contact you within 1 Hour
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
Sit and relax as our customer representative will contact you within 1 business day
In a crystalline solid, anions B are arranged in a cubic close packing. Cations A are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied, what is the formula of the solid In a crystalline solid, anions B are arranged in a cubic close packing. Cations A are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied, what is the formula of the solid
no of atoms ina ccp unit cell-simila to fcc=4therefore no of B atom present=4no of A atom=tertrahedral void and octahedral void(8+4)=12formula of the compound=A12B4thanks and regardssunil kraskIITian faculty
For A, no. of ov= 4, so no. of TV will also be 4 ( as equally distributed). So, A=8; B=4 (no. of atoms in fcc).... formula is A2B
NO. OF ATOMS IN CCP =4THEREFORE,NO. OF ATOMS IN CLOSE PACKING =B=4WE KNOW OCTAHEDRAL VOIDS ARE EQUAL TO THE NO. OF ATOMS IN CLOSE PACKINGTHEREFORE,OCTAHEDRAL VOIDS =4AND TETRAHEDRAL VOIDS ARE 2(NO OF ATOMS IN CLOSE PACKIN),WHICH IS EQUAL TO 8GIVEN, A ATOMS ARE EQUALLY DISTRIBUTED BETWEEN BOTH VOIDS AND A ATOMS COVER ALL OCTAHEDRAL VOIDS.THEREFORE TOTAL A ATOMS =4(OCTAHEDRAL ATOMS)+4(TETRAHEDRAL ATOMS)=8 ATOMSTHEREFORE FORMULA OF AB=A8B4 OR A2B.NOTE THAT 4 TETRAHEDRAL VOIDS ARE NOT OCCUPIED
Dear student,Please find the attached solution to the problem B = 4 (fcc lattice)Since there are 8 tetrahedral and 4 octahedral voids in fcc out of which all 4 octahedral voids are filled and an equal number of tetrahedral voids too.Hence, A = 4 + 4 = 8Hence, Formula is A8B4or, The empirical formula is A2B Hope it helps.Thanks and regards,Kushagra
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -