The sum of mole fractions of all components in a solution equals:
AAvogadro's number
B100
C0
D1
Answer & Solution
Correct answer: D. 1
By definition, ∑xᵢ = (∑nᵢ)/(∑nᵢ) = **1**. This is why for a binary system, x_A + x_B = 1.
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