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# In orthorhombic, the value of a, b and c are respectively $4.2 A^{\large\circ}, 8.6 A^{\large\circ}$ and $8.3 A^{\large\circ}$. Given the molecular mass of the solute is 155 $g mol^{–1}$ and that of density is 3.3 g/cc, the number of formula units per unit cell is

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