Calculate Mass of 0.412 Mol of Nacl
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Calculating the mass of a substance from its molar amount is a fundamental chemistry calculation. This guide explains how to determine the mass of 0.412 moles of sodium chloride (NaCl) using the molar mass of the compound.
Introduction
When working with chemical quantities, chemists often need to convert between moles and mass. The molar mass of a compound is the mass of one mole of that substance, expressed in grams per mole (g/mol). By multiplying the number of moles by the molar mass, you can find the mass of the sample.
For sodium chloride (NaCl), the molar mass is calculated by summing the atomic masses of sodium and chlorine. Sodium has an atomic mass of approximately 22.99 g/mol, and chlorine has an atomic mass of approximately 35.45 g/mol. Therefore, the molar mass of NaCl is 22.99 + 35.45 = 58.44 g/mol.
Formula
The relationship between moles, mass, and molar mass is expressed by the formula:
Mass (g) = Moles × Molar Mass (g/mol)
Where:
- Mass is the mass of the substance in grams
- Moles is the amount of substance in moles
- Molar Mass is the mass of one mole of the substance in grams per mole
Calculation
To calculate the mass of 0.412 moles of NaCl:
- Determine the molar mass of NaCl: 58.44 g/mol
- Multiply the number of moles by the molar mass:
Mass = 0.412 mol × 58.44 g/mol
Mass = 24.05 g
The mass of 0.412 moles of NaCl is approximately 24.05 grams.
Example
Let's consider another example to illustrate the calculation. Suppose you have 0.25 moles of NaCl:
- Molar mass of NaCl remains 58.44 g/mol
- Calculate the mass:
Mass = 0.25 mol × 58.44 g/mol
Mass = 14.61 g
This shows that the mass of NaCl scales directly with the number of moles.
FAQ
What is the molar mass of NaCl?
The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol, calculated by adding the atomic masses of sodium (22.99 g/mol) and chlorine (35.45 g/mol).
How do I convert moles to grams?
To convert moles to grams, multiply the number of moles by the molar mass of the substance. For example, 0.412 moles of NaCl is 0.412 × 58.44 = 24.05 grams.
Why is the molar mass important?
The molar mass provides a bridge between the atomic scale and the macroscopic scale. It allows chemists to relate the number of atoms or molecules to measurable quantities like mass.