Calculates the percentage by mass of each element in a chemical compound.
Start with your values, or try a preset.
Enter Atomic Weight of Element 1 (g/mol), Number of Atoms of Element 1, Atomic Weight of Element 2 (g/mol), and Number of Atoms of Element 2 in the units shown.
Read Molar Mass (g/mol), Percent Composition of Element 2, and Percent Composition of Element 1 in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Atomic Weight of Element 1 (g/mol): 1.008; Number of Atoms of Element 1: 2; Atomic Weight of Element 2 (g/mol): 16.00; Number of Atoms of Element 2: 1
Molar Mass (g/mol): 18.016 g/mol; Percent Composition of Element 2: 88.80994671 %; Percent Composition of Element 1: 11.19005329 %
Atomic Weight of Element 1 (g/mol): 12.01; Number of Atoms of Element 1: 1; Atomic Weight of Element 2 (g/mol): 16.00; Number of Atoms of Element 2: 2
Molar Mass (g/mol): 44.01 g/mol; Percent Composition of Element 2: 72.71074756 %; Percent Composition of Element 1: 27.28925244 %
Atomic Weight of Element 1 (g/mol): 12.01; Number of Atoms of Element 1: 1; Atomic Weight of Element 2 (g/mol): 1.008; Number of Atoms of Element 2: 4
Molar Mass (g/mol): 16.042 g/mol; Percent Composition of Element 2: 25.13402319 %; Percent Composition of Element 1: 74.86597681 %
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