Chemistry Formula
Mass to Moles Formula
Converts sample mass to amount of substance in moles.
Formula Summary
Mass to Moles
Converts sample mass to amount of substance in moles.
- Category
- Chemistry
- Equation
- n = m ÷ M
- Calculator
- Use Mass to Moles Calculator →
Equation
n = m ÷ M
Variables
- n = moles
- m = sample mass
- M = molar mass
How to Use This Formula
- Identify the known values from the problem statement.
- Convert all values into compatible units.
- Substitute the values into the equation and calculate the result.
- Check that the final answer has the correct unit and meaning.
Explanation
The mass to moles formula converts the measured mass of a substance into the amount of substance in moles. It uses the molar mass as the conversion factor.
Worked Example
For 18 g of water with a molar mass of 18 g/mol, the number of moles is 18 ÷ 18 = 1 mol.
Common Mistakes
- Using the wrong molar mass value.
- Confusing grams with moles.
- Using incorrect mass units.
Applications
- Chemical reaction calculations.
- Stoichiometry problems.
- Laboratory substance measurements.
Related Formulas
Percent Yield
% yield = actual ÷ theoretical × 100
Compares the measured product yield with the theoretical yield.
Learn formula →Mole Fraction
Xᵢ = nᵢ ÷ nₜₒₜₐₗ
Finds a component's fraction of the total amount in a mixture.
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