Question

An element has body centered cubic structure with a cell edge of 3.0 A. The density of the metal is 2 amu/ų. Atoms present in 243 × 10²⁴ amu of the element are ______ × 10²⁴.

Options

• 7.00

• 2.00

• 5.00

• 9.00

Answer 1

An element has body centered cubic structure with a cell edge of 3.0 A. The density of the metal is 2 amu/ų. Atoms present in 243 × 10²⁴ amu of the element are 9.00 × 10²⁴.

Explanation:

No. of atoms in unit cell = 2

Mass of unit cell = 2 × 3³ = 54

∴ atomic weight = `54/2` = 27

∴ No. of. atoms = `(243 xx 10^24)/27` 9.00 × 10²⁴