Percent Composition Calculator

Percent Composition is evaluated from Atomic Mass - Element 1, Atom Count - Element 1 and Atomic Mass - Element 2. The calculation reports Molar Mass,% Element 1 and% Element 2.

Results

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About the Percent Composition Calculator

Percent Composition is treated here as a quantitative relation between Atomic Mass - Element 1, Atom Count - Element 1, Atomic Mass - Element 2 and Atom Count - Element 2 and Molar Mass,% Element 1,% Element 2 and% Element 3.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
The calculation applies the following relations exactly as recorded in the metadata:% element = (n x atomic_mass / molar_mass) x 100
Molar mass = Sigma(nᵢ x Aᵢ) for all elements
All percentages sum to 100%

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

The calculation applies the following relations exactly as recorded in the metadata:% element = (n x atomic_mass / molar_mass) x 100
Molar mass = Sigma(nᵢ x Aᵢ) for all elements
All percentages sum to 100%

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Water — H₂O

Inputs

elem1_mass: 1.008 elem1_count: 2 elem2_mass: 15.999 elem2_count: 1
Molar Mass: 18.015 g/mol. % Element 1: 11.19%. % Element 2: 88.81%

With Atomic Mass - Element 1 = 1.008, Atom Count - Element 1 = 2, Atomic Mass - Element 2 = 15.999 and Atom Count - Element 2 = 1 as the stated inputs, the result is Molar Mass = 18.015 g/mol,% Element 1 = 11.19% and% Element 2 = 88.81%. Each value corresponds to the declared output fields.

Example 2: Urea Fertilizer — CO(NH₂)₂

Inputs

elem1_mass: 14.007 elem1_count: 2 elem2_mass: 1.008 elem2_count: 4 elem3_mass: 15.999 elem3_count: 1
Molar Mass: 48.045 g/mol. % Element 1: 58.31%. % Element 2: 8.39%. % Element 3: 33.3%

With Atomic Mass - Element 1 = 14.007, Atom Count - Element 1 = 2, Atomic Mass - Element 2 = 1.008 and Atom Count - Element 2 = 4 as the stated inputs, the result is Molar Mass = 48.045 g/mol,% Element 1 = 58.31% and% Element 2 = 8.39%. Each value corresponds to the declared output fields.

Example 3: Glucose — Blood Sugar (C₆H₁₂O₆)

Inputs

elem1_mass: 12.011 elem1_count: 6 elem2_mass: 1.008 elem2_count: 12 elem3_mass: 15.999 elem3_count: 6
Molar Mass: 180.156 g/mol. % Element 1: 40%. % Element 2: 6.71%. % Element 3: 53.28%

With Atomic Mass - Element 1 = 12.011, Atom Count - Element 1 = 6, Atomic Mass - Element 2 = 1.008 and Atom Count - Element 2 = 12 as the stated inputs, the result is Molar Mass = 180.156 g/mol,% Element 1 = 40% and% Element 2 = 6.71%. Each value corresponds to the declared output fields.

Example 4: Iron Ore — Hematite (Fe₂O₃)

Inputs

elem1_mass: 55.845 elem1_count: 2 elem2_mass: 15.999 elem2_count: 3
Molar Mass: 159.687 g/mol. % Element 1: 69.94%. % Element 2: 30.06%

With Atomic Mass - Element 1 = 55.845, Atom Count - Element 1 = 2, Atomic Mass - Element 2 = 15.999 and Atom Count - Element 2 = 3 as the stated inputs, the result is Molar Mass = 159.687 g/mol,% Element 1 = 69.94% and% Element 2 = 30.06%. Each value corresponds to the declared output fields.

Common Use Cases

  • Find the percent carbon in glucose
  • Calculate nitrogen percent in a fertilizer compound
  • Determine oxygen percent by mass in water