Question

The sum of all mole fraction for a mixture is always equal to ____________.

Options

• 2

• 1

• 0

• 3

Answer 1

The sum of all mole fraction for a mixture is always equal to 1.

Explanation:

X_A = `("N"_"A")/(("N"_"A" + "N"_"B"))` and X_B = `("N"_"B")/(("N"_"A" + "N"_"B"))`

So X_A + X_B = 1