To calculate the number of molecules in 3Fe(OH)3, we need to use Avogadro's number, which is the number of particles (atoms, molecules, or ions) in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 particles per mole.
First, let's calculate the molar mass of 3Fe(OH)3:
The molar mass of Fe is 55.85 g/mol.
The molar mass of O is 16.00 g/mol.
The molar mass of H is 1.01 g/mol.
So, the molar mass of Fe(OH)3 is:
3(55.85 g/mol) + 3(16.00 g/mol) + 3(1.01 g/mol) = 241.02 g/mol
Now, we can use the molar mass to calculate the number of moles of 3Fe(OH)3:
mass of 3Fe(OH)3 = 241.02 g/mol x 1 mole = 241.02 g
mass of 3Fe(OH)3 = 3 moles x (6.022 x 10^23 particles per mole) = 1.807 x 10^24 molecules
Therefore, there are 1.807 x 10^24 molecules in 3Fe(OH)3.