Ice crystallizes in a hexagonal lattice. At low temperatures at whi...

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Ice crystallizes in a hexagonal lattice. At low temperatures at which the structure was
\( \mathrm{P} \) determined, the lattice constants were \( a=4.53 \AA \)

W and \( b=7.41 \AA \) as shown in the figure. How many \( \mathrm{H}_{2} \mathrm{O} \) molecules are contained in an unit cell? (Given that density of ice \( =0.92 \mathrm{~g} / \mathrm{cm}^{3} \) )
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