Mole fraction calculator
Mole fraction is moles of one component over total moles, and the fractions of all components sum to one.
g/mol
g/mol
Mole fraction of A
0.221 27
- Mole fraction of B
- 0.778 73
- Mole percent of A
- 22.127 %
- Moles of A
- 0.555 093 mol
- Moles of B
- 1.953 55 mol
Show the working
- Mass of component A = 10
- Molar mass of A = 18.015
- Mass of component B = 90
- Molar mass of B = 46.07
- Moles of A = 10 / 18.015 = 0.555 093
- Moles of B = 90 / 46.07 = 1.953 55
- Mole fraction of A = 0.555 093 / (0.555 093 + 1.953 55) = 0.221 272
- Mole fraction of B = 1.953 55 / (0.555 093 + 1.953 55) = 0.778 728
- Mole percent of A = 0.221 272 * 100 = 22.1272
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- x_A = n_A / (n_A + n_B)