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The element Hf has hcp packing with a hexagonal unit cell. The density of Hf is 13.31 g/cm3 and the cell volume is 4.477 x 10-23 cm3. Calculate the value of Avogadro's number to three significant figures based on these data. (Note: the value may differ from the tabular value).

Given:

Molar Mass (g/mol)

Hf 178.49

Packing

bcc body centered cubic

ccp cubic close pack

hcp hexagonal close pack

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