To calculate avogadro's number from the measured density of copper shot, what additional information is not needed? the molar mass of copper the atomic number of copper the length of the edge of the unit cell of copper the number of copper atoms occupying one unit cell of copper

Answer is Atomic Number of Cu.

Explanation: For a unit cell, density can be written as

For a unit cell, Mass will be

where Z= Number of atoms

m = Mass of an atom

Mass of an atom can be calculated by,

Volume of a unit cell =

where a = edge length

Now, putting Mass and Volume of an atom in density, the equation becomes

For the calculation of Avagadro's number,

we can see from the equation, we need

1. Molar mass of atom

2. Density of unit cell

3. Edge length of the unit cell

4. Number of atoms occupying one unit cell.

Hence, for the above question there is no need for the Atomic Number of atom.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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