Mole is used in chemistry. It is the general standard scientific notation unit. It measures the elements, atoms, and chemicals giving large or small quantities. It is using Avogadro numbers for this fact.
Mole defined several atoms determined while testing to be found in grams in the past time but in the international system of unit written as SI, the measure numbers in the mole also stand the Avogadro’s numbers.
One mole of a substance is equal to the Avogadro number in general.
Table of Contents
What is a mole?
A mole is generally a standard scientific unit used to abbreviate a large number of atoms or chemical substances. Avogadro’s numbers are said to be the mole for some specific chemical units. The Avogadro number is 6.0221408 x 1023.
The mole must be used for atoms, ions, or molecules. In simple words, the appropriate unit use due to a large number of ions, molecules, atoms, or others in the form of a substance is said to be the mole.
In past, up to 2018, the mole was defined as the number of atoms or ions in 12 grams of carbon-12, but in the conference of the international system of units for the weight and measures, it is decided that it is more effective to use one mole would be 6.0221408 x 1023 instead of 12 grams of carbon-12.
How to calculate Mole?
For the calculation of the mole of a material or substance, simply divide the mass of the material or substance by its molar mass. The mass of one mole or grams of the given substance or material is the molar mass of that substance or material.
To calculate accurately follow some steps.
- Calculate the mass of the given material or substance.
- Use a table available in chemistry for telling the molecular mass of chemicals, atoms, or ions. That table is known as the periodic table.
- Divide the mass of the given material or substance by its molecular mass.
To get the result of your problem according to the above steps, you can use mole calculator.
The general formula for this is written as.
Mole = mass of a substance or material / molar mass
Mole = m / M
Mass of the substance or material should be in grams and the molar mass should be in grams per mole.
Example 1
How many moles are present in 19 grams of hydrogen gas?
Solution
Step 1: Identify the weight and molecular mass of the hydrogen gas.
Mass of hydrogen = m = 19 grams
Molar mass of hydrogen by periodic table = M = 1.00794 g/mol
Step 2: Write the general formula of mole.
Mole = mass of a substance or material / molar mass
Mole = m / M
Step 3: Put the value of mass and molar mass of hydrogen in the above formula.
Mole = 19 g / 1.00794 g/mol
Mole = 18.85 mol
Example 2
How many moles are present in 29 grams of nitrogen gas?
Solution
Step 1: Identify the weight and molecular mass of the nitrogen gas.
Mass of nitrogen = m = 29 grams
Molar mass of nitrogen by periodic table = M = 28.02 g/mol
Step 2: Write the general formula of mole.
Mole = mass of a substance or material / molar mass
Mole = m / M
Step 3: Put the value of mass and molar mass of nitrogen in the above formula.
Mole = 29 g / 28.02 g/mol
Mole = 1.03 mol
What is Molar Mass?
Molar mass is generally a weight along with taking some space. For chemical experiments, the molecules from which substances have to make must have an accurate measurement for the perfect chemical experiment.
We can calculate the molar mass accurately if moles are given then simply, we have to use the mole formula and calculate the molar mass by rearranging the formula. The molecular weight is also named used for the molar mass. The International System of Units for the molar mass or SI unit is mole per gram
Mole = mass of a substance or material/molar mass
Molar mass = mass of a substance or material / Mole
Example 1
What is the molar mass of nitrogen gas if the weight of the nitrogen gas is 29 grams and the numbers of moles are 1.03 mol.
Solution
Step 1: Identify the weight of the nitrogen gas and the number of moles from the given problem.
Mass of nitrogen = m = 29 grams
Mole of nitrogen = n = 1.03 mol
Step 2: Write the general formula of molar mass.
Molar mass = mass of a substance or material / Mole
Molar mass = M = m / n
Step 3: Put the value of mass and molar mass of nitrogen in the above formula.
Molar mass = 29 g / 1.03 mol
Molar mass = 28.02 gram per mole
Hence, the molar mass of nitrogen is 28.02 grams per mole.
Example 2
What is the molar mass of nitrogen gas if the weight of the Hydrogen gas is 19 grams and the numbers of moles are 18.85 mol.
Solution
Step 1: Identify the weight of the Hydrogen gas and the number of moles from the given problem.
Mass of hydrogen = m = 19 grams
Mole of nitrogen = n = 18.85 mol
Step 2: Write the general formula of molar mass.
Molar mass = mass of a substance or material / Mole
Molar mass = M = m / n
Step 3: Put the value of mass and molar mass of hydrogen in the above formula.
Molar mass = 19 g / 18.85 mol
Molar mass = 1.00794 gram per mole
Hence, the molar mass of hydrogen is 1.00794 grams per mole.
Summary
Mole is generally an international system of unit or SI unit used to standardize atoms, molecules, or ions, or different substances or materials in the scientific notation. Mole is calculated by the division of mass with the molar mass of any substance or material.
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