CD 3 C 3 D C 4 D 3 C 2 D 3 C 3 D 2 C 3 D 4 C 2 D 2 Use what you learned in lab a
ID: 792343 • Letter: C
Question
CD3C3D C4D3C2D3C3D2C3D4C2D2Use what you learned in lab about atoms in cubic structures to answer the following questions about a solid whose crystal structure was found to have atoms "A" in corner and center sites and "B" in the face sites of a cubic unit cell. How many "A"s are there in a unit cell? How many "B"s are there in a unit cell? What is the correct chemical formula for this solid? A2B3 A3B2 A3B4 AB3 A3B A4B3 A2B2 Use what you learned in lab about atoms in cubic structures to answer the following questions about a solid whose crystal structure was found to have atoms "C" in edge and center sites and "D" in the face sites of a cubic unit cell. How many "C"s are there in a unit cell? "C"(s) How many "D"s are there in a unit cell? "D"(s) What is the correct chemical formula for this solid? CD3 C3D C4D3 C2D3 C3D2 C3D4 C2D2
Explanation / Answer
(1) Number of A atoms = 8 x 1/8 + 1 x 1 (8 corner + 1 center)
= 2 A atoms
Number of B atoms = 6 x 1/2 (6 face)
= 3 B atoms
Ratio of A : B = 2 : 3
Chemical formula is A2B3
(2) Number of C atoms = 12 x 1/4 + 1 x 1 (12 edge + 1 center)
= 4 C atoms
Number of D atoms = 6 x 1/2 (6 face)
= 3 D atoms
Ratio of C : D = 4 : 3
Chemical formula is C4D3