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A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies. The density of the copper complex is found to be 7.62 g cm⁻³. The molar mass of copper complex is ____ g mol⁻¹ (Nearest integer) [Given: N_A = 6.022 × 10²³ mol⁻¹]

1. 100
2. 200
3. 300
4. 400

Correct answer: 100

Solution

For CCP, Z=4. M = (density x a^3 x NA)/Z = (7.62 x (0.4518e-7 cm)^3 x 6.022e23)/4 ~ 106 g/mol. Nearest given integer is 100.

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