Avogadro's number times 5.6 (or about 33.6 times ten to the 23rd power.
2,2 moles of plutonium: 13,248711938.1023 atoms.
A sample of 3,2x10 atoms of nickel is equal to 0,53.10e-23 moles.
44 moles of atoms
2,89 moles of aluminium contain 17,40398707673.1023 atoms.
4,80 moles of Fe contain 28,9062761136.10e23 atoms.
2 moles of benzene gives 12 moles of hydrogen atoms since benzene is C6H6
0.125 moles x 6.02x10^23 atoms/mole = 7.53x10^22 atoms
4.2 moles of CS2 contain 8,4 moles sulfur.
48,177 134 32.1023 atoms
There are 58.6934 gram in one mole of Ni atoms, so there are125(g Ni) / 58.6934 (g.mol-1 Ni) = 2.13 moles in 125 gram Ni
0.0845 moles of tungsten is equal to 0,50887.10e23.
First you have to find out the number of moles of Nickel in 0.63g. Do this by dividing 0.63 by the molecular weight of Nickel; 58.69g. 0.63/58.69= 0.01 mol (2 d.p.) In one mole there are 6.02x1023 atoms. Therefore in 0.01 moles of Nickel there will be: 0.01 x 6.02x1023 = 9.15x1015 atoms.