What is the theoretical density of crystalline K? — Solid State Chemistry Question

💡 Solution & Explanation

Density ρ = (Z * M) / (Na * a^3). For BCC, Z = 2. a = 5.0 A = 5.0 * 10^-8 cm. M = 39 g/mol. ρ = (2 * 39) / (6.022 * 10^23 * (5 * 10^-8)^3) = 78 / (6.022 * 125) = 78 / 75.275 = 1.04 g/cm3.