moles of iron in 139.625g

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22-01-2025

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Meta Description: Learn how to calculate the number of moles of iron in 139.625g of iron. This comprehensive guide provides a step-by-step explanation, including the necessary formula and calculation. Perfect for chemistry students and anyone needing a refresher on mole calculations!

Iron (Fe) is a crucial element in many applications, from construction to biology. Understanding how to calculate the number of moles present in a given mass of iron is a fundamental skill in chemistry. This article will guide you through the process of determining the moles of iron in 139.625g of the pure element.

Understanding Moles

Before we begin, let's refresh our understanding of the mole concept. A mole (mol) is a unit of measurement in chemistry representing Avogadro's number (approximately 6.022 x 10²³) of particles (atoms, molecules, ions, etc.). It's essentially a way to count extremely large numbers of tiny particles.

The molar mass of an element is the mass of one mole of that element, usually expressed in grams per mole (g/mol). You can find this on the periodic table; for iron (Fe), the molar mass is approximately 55.845 g/mol.

Calculating Moles of Iron

To calculate the number of moles of iron in 139.625g, we'll use the following formula:

Moles = Mass (g) / Molar Mass (g/mol)

Here's how to apply it:

1. Identify the given mass: We have 139.625g of iron.

2. Find the molar mass: The molar mass of iron (Fe) is 55.845 g/mol (from the periodic table).

3. Substitute values into the formula:

   Moles = 139.625 g / 55.845 g/mol

4. Calculate:

   Moles ≈ 2.500 moles

Therefore, there are approximately 2.500 moles of iron in 139.625g of iron.

Practical Applications

Understanding mole calculations is critical in various chemical applications, including:

• Stoichiometry: Determining the amounts of reactants and products in chemical reactions. Knowing the moles of iron allows for precise calculations in reactions involving iron.
• Solution Preparation: Accurately preparing solutions of a specific concentration requires knowing the number of moles of solute.
• Analytical Chemistry: Many analytical techniques rely on mole calculations for accurate quantification of substances.

Further Considerations

• Purity: This calculation assumes 100% pure iron. If your sample contains impurities, the actual number of moles of iron will be lower.
• Significant Figures: The answer (2.500 moles) reflects the significant figures in the given mass (139.625g). Always pay attention to significant figures in scientific calculations.

This guide provides a clear and concise explanation of how to calculate the moles of iron in a given mass. Remember to always double-check your units and significant figures for accurate results. Understanding mole calculations is fundamental to many aspects of chemistry and related fields.