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A solid having density of 9×10 3 kg m –3 forms face centred cubic crystals of edge length 2 200 pm. What is the molar mass of the solid? [Avogadro constant ≅ 6 × 10 23 mol –1 , π ≅ 3]

1. 0.0305 kg mol –1
2. 0.4320 kg mol –1
3. 0.0216 kg mol –1
4. 0.0432 kg mol –1

Correct answer: 0.0305 kg mol –1

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