49.1740 g (6.02 x 1023 atoms) / (91.22 g) = 3.25 x 1023 atoms
According to http://en.wikipedia.org/wiki/Zirconium (whether you're willing to trust that), it seems the density of Zirconium around room temperature is 6.52 g/cm^3.
The fourth ionization energy of zirconium corresponds to the energy required to remove the fourth electron from a Zirconium atom in its gaseous state. The specific value of this ionization energy would depend on the specific electronic configuration and the atomic structure of Zirconium.
6,687.1023 chlorine atoms
The number of atoms of lead is 6,68.10e23.
5 g of sulfur contain 0,94.10e23 atoms.
The answer is 3.32*10^23 atoms
There are approximately 163,163 atoms of carbon in 0.020 g of carbon.
There are 1.15 x 10^21 atoms in 0.220 g of P2O5.
The equivalent weight of zirconium sulfate is calculated by dividing the molecular weight by its valency. Zirconium sulfate has a molecular formula of Zr(SO4)2, so its valency would be 2. The molecular weight of zirconium sulfate is around 332 g/mol, so the equivalent weight would be around 166 g/mol.
For plutonium 239: ca. 74,68.1023 atoms
The number of atoms is 28,099.10e23.
390cm²