alleryMole fraction x_A is:
An_A / (n_A + n_B)
BConcentration
Cmass_A / total mass
Dn_A / V
Answer & Solution
Correct answer: A. n_A / (n_A + n_B)
Mole fraction x_A = moles of A / total moles in solution.
Dimensionless, sums to 1 over all components.
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