Density of one form of \( \mathrm{CaCO}_{3} \) solid is \( 2.93 \mathrm{~g} / \mathrm{cc} \) and...

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Density of one form of \( \mathrm{CaCO}_{3} \) solid is \( 2.93 \mathrm{~g} / \mathrm{cc} \) and it has orthorhombic unit cell parameters: \( \mathrm{a}=4.9 \AA, \mathrm{b}=5.7 \AA \) and \( \mathrm{c}=8 \AA \). Calculate the number of \( \mathrm{Ca}^{2+} \) units per unit cell.
(a) 4
(b) 6
(c) 8
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