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Reactivity with Halogens and Hydrogen (Group 2)

ice crystalli...

Question

ice crystallises in a hexagonal lattice.at the low temperatures at which the structure was determined, the lattice constants were a= 4.53 Angstroms ; b=7.41 Angstorms .How many H molecules are contained in a unit cell

ans =4 ?

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Solution

As we know, density =nM/VN, where n is the number of atoms per unit cell.
Density =0.92=n×18/(a²b)×(6×10²³)= ⟹n=4
So, one unit of this structure contains 4 moleculesmolecules of water.

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