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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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