5 moles of helium He atoms is equivalent to 20,013 g.
There are twice as many oxygen atoms as carbon atoms in carbon dioxide, so 100.0 moles of carbon dioxide would contain 200.0 moles of oxygen atoms.
To calculate the number of moles from the number of atoms, we need to divide the number of atoms by Avogadro's number (6.022 × 10^23), which gives 3.59 moles of iron atoms.
There are 9.12 moles of hydrogen atoms in 4.56 moles of NH2NH2. Each NH2NH2 molecule contains 2 hydrogen atoms.
5.66 x 10^23 atoms of xenon is equal to 0.094 moles.
In 0.800 moles of MgO, there are the same number of oxygen atoms as there are in 0.800 moles of O atoms. One mole of MgO contains one mole of oxygen atoms, which is equivalent to 6.022 x 10^23 oxygen atoms.
1,638 moles contain 9,864266723766.10e23 atoms.
20 moles
This is equivalent to 1,4 moles.
There are twice as many oxygen atoms as carbon atoms in carbon dioxide, so 100.0 moles of carbon dioxide would contain 200.0 moles of oxygen atoms.
1,0.10e9 atoms is equivalent to 0,166.10e-14 moles.
8.93 1021 atoms equal 0,0148 moles.
Seventeen moles of hydrogen correspond to 204,75.10e23 atoms.
2,50 moles of silicon contain 15,055352142.10e23 atoms.
10,0 moles of bromine atoms contain 60,22140857.1023 atoms.Attention: valid for bromine atoms !.
The number of chlorine atoms in 2,00 moles of CCl4 is 48,113.10e23.
6,1x10-3 moles of carbon 36,7350592277.1020 atoms.
2,80 1024 atoms of silicon equals 0,465 moles.