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Weight of one mole of unit cells of NaCl crystals is __

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234 gm

234 amu

58.5amu

58.5 gm

answer is C.

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Detailed Solution

NaCl has fcc arrangement Cl¯ ions occupy corners and face centers.

Each unit cell contains 4 Na⁺ and 4 Cl^- ions

one mole of unit cells contains 4N_A of Na⁺ and 4N_A of Cl^- ions

$∴$ Mass of one mole of unit cells of NaCl crystals= 4(23)+4(35.5)=234gm

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