If you have 25.4 g Fe, how many moles and atoms are in the sample?

Answer 1

Got a Periodic Table?

Divide the mass of iron in the problem by the molar mass of iron quoted on the Periodic Table....each mole of iron represents #6.022xx10^23*"iron atoms"#........

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Answer 2

Naomi Aronson

To find the number of moles of iron (Fe) in the sample:

Determine the molar mass of iron (Fe), which is approximately 55.845 g/mol.
Divide the mass of the sample by the molar mass of iron: Number of moles = Mass of sample / Molar mass of iron Number of moles = 25.4 g / 55.845 g/mol

To find the number of atoms of iron (Fe) in the sample:

Use Avogadro's number, which is approximately (6.022 \times 10^{23}) atoms/mol.
Multiply the number of moles by Avogadro's number: Number of atoms = Number of moles × Avogadro's number

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.