Question

Fe²0³, number of moles 1, molar mass ? Molar mass?

Answer 1

Answer:

We will use the formula below to answer the question:

atomic weight of element ×number of atoms given by subscript #= molar mass

First, you want to have a periodic table available so you can determine the atomic weight of Fe and O:

Fe has an atomic weight of 55.85 g/mol

O has an atomic weight of 16.00 g/mol

From the chemical formula, there are 2 iron atoms, so the atomic mass has to be multiplied by 2, which gives you a value of 111.7 g/mol

Next, you have 3 oxygen atoms, so you would multiply the atomic mass of O by 3 to obtain an atomic weight of 48.00 g/mol

Now you want to add the mass of each atom together to obtain the molar mass of the entire compound:

111.7 g/mol + 48.00 g/mol = 159.70 g/mol

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