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Grams to Moles Calculator

Select the chemical element from the list or enter molar mass of your choice. This calculator will let you convert the mass to moles.

Take Action: Choose one of the common chemicals or enter your own molar mass value

Chemical Name:

Others:

g/mol ▾

Grams to Atom

To Calculate:

Number of moles:

ng ▾

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An online grams-to-moles calculator is a helpful tool designed to convert grams to moles, moles to grams, calculate molar mass, and determine the number of molecules or atoms in a substance. Let’s explore how it works with practical examples.

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What Is A Mole?

In chemistry:

“A mole is the amount of a substance.”

Essentially, mole is the SI unit for measuring substance quantity.

For example:

1 mole of any substance contains exactly 6.02214076 × 10²³ elementary entities, which could be atoms, molecules, ions, or electrons.

Grams To Moles Formula:

Use this formula to convert grams to moles:

$$ n = \frac{m}{M} $$

Where:

n = Number of moles

m = Mass in grams

M = Molar Mass (g/mol)

How To Convert Grams To Moles?

While a free grams-to-moles calculator speeds up your work, knowing the manual method is important. Let’s see some examples.

Example #01:

Find moles in 10 liters of water (assuming 1 L ≈ 1 kg).

Solution:

Mass of water = 10 L × 1000 g/L = 10000 g

Molar mass of water = 18.015 g/mol

$$ n = \frac{m}{M} = \frac{10000}{18.015} \approx 555.1 \text{ moles} $$

Verify using a grams to moles calculator.

Example #02:

Calculate the moles in 5 grams of NaOH.

Solution:

Molar mass of NaOH = 39.997 g/mol

$$ n = \frac{5}{39.997} \approx 0.125 \text{ moles} $$

Example #03:

Convert 3 moles of Sulfuric Acid (H₂SO₄) into grams.

Solution:

Molar mass of H₂SO₄ = 98.079 g/mol

$$ m = n \times M = 3 \times 98.079 \approx 294.24 \text{ g} $$

How the Grams To Moles Calculator Works?

Steps to use the calculator:

Select the type of compound (element, salt, or molecule)
Choose the specific compound
The molar mass will appear automatically
Select whether to calculate moles, grams, or molar mass
Enter the known value
Click "Calculate"

Output:

The mass of the substance
The number of moles
The molar mass
The number of molecules or atoms

FAQ’s:

What is 1 gram of a mole?

1 gram of a mole is a fraction of a mole, representing the number of molecules or atoms proportional to the substance's molar mass.

How do you find moles from molarity?

$$ \text{Moles} = \text{Molarity (M)} \times \text{Volume (L)} $$

Use a moles to grams calculator for quick calculation.

How many moles are there in 1 kg?

The number of moles in 1 kg depends on molar mass. For example, 1 kg of carbon-12 contains 1000 g / 12 g/mol ≈ 83.33 moles.

Are mole and gram atoms the same?

Not exactly. A gram-atom is equal to the atomic mass in grams, while a mole always contains 6.022 × 10²³ particles.

How many moles are there in 5 g of an element?

Example: Molar mass of HCl = 36.461 g/mol

$$ n = \frac{5}{36.461} \approx 0.137 \text{ moles} $$

Conclusion:

Converting mass to moles helps write chemical formulas and understand reaction ratios. A free grams to moles calculator ensures accuracy and saves time.

References:

From Wikipedia: Mole (unit), Gram-mole, Molar mixing ratio

From Lumen Learning: Mass-to-Mole Conversions

From Khan Academy: Stoichiometry

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