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Answer: The molar mass of a substance is the mass of one mole of its atoms or molecules. It is usually expressed in grams per mole (g/mol) and helps chemists calculate how much of a substance is needed or produced in a chemical reaction. Let’s now talk about Iron (Fe), a very important element in chemistry and everyday life.
What is the Molar Mass of Iron?
The molar mass of iron (Fe) is 55.845 g/mol
This means that 1 mole of iron atoms weighs 55.845 grams.
How Is Molar Mass Determined?
Molar mass is determined based on the atomic mass of the element. The atomic mass is found on the Periodic Table and is the average mass of all isotopes of that element, taking into account how common each isotope is. In the case of iron:
- Iron has several isotopes, like Fe-54, Fe-56, Fe-57, and Fe-58.
- The atomic mass of iron is an average of all these isotopes.
- That’s why it is not a whole number.
So, when you look at the Periodic Table, iron’s atomic mass is written as 55.845. Therefore, this is also taken as its molar mass.
Why Is Molar Mass Important in Chemistry?
Molar mass helps us to:
- Convert grams into moles and vice versa.
- Balance chemical equations properly.
- Understand how much of each substance is involved in a reaction.
Let’s understand this with the help of an example:
Imagine you have 111.69 grams of iron. How many moles is that?
Moles of Fe= 111.69 g/ 55.845 g/mol≈ 2.0 mol
So, 111.69 grams of iron contains 2 moles of iron atoms.
So, in short,
- Element: Iron (Fe)
- Molar Mass: 55.845 g/mol
- This value is useful for solving mole-related problems in chemistry.
Common Doubts on Chemistry:
