44 moles of atoms
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In Ca(HCO3)2, there are 2 moles of carbonate ions (CO3^2-), each containing 3 atoms. So there are 6 atoms in 1 molecule of Ca(HCO3)2. Therefore, in 4 moles of Ca(HCO3)2, there are 4 x 6 = 24 moles of atoms.
In CS2, there is 1 sulfur atom per molecule. Therefore, 4.2 moles of CS2 would contain 4.2 moles of sulfur atoms.
There are 1.8 x 10^24 atoms of sodium in 3 moles. The mass of 3 moles of sodium is 69 grams.
In one mole of CH4, there is one carbon atom and four hydrogen atoms. Therefore, in 2 moles of CH4, there would be a total of 8 hydrogen atoms.
There are 6 moles of hydrogen atoms in 3 moles of methane since the chemical formula for methane (CH4) contains four hydrogen atoms for every one carbon atom.
To find the number of atoms in 4.80 moles of Fe, you need to use Avogadro's number, which is 6.022 x 10^23 atoms/mol. So, 4.80 moles of Fe would contain: 4.80 moles x 6.022 x 10^23 atoms/mol = 2.89 x 10^24 atoms of Fe.