Question

) If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles of solvent? – a) 9, b) 4.5, c) 1.5, d) 3. v

Answer 1

Answer:

(b) 4.5

Explanation:

We know that

Mole fraction of solute + Mole fraction of solvent = 1

Mole fraction of solvent = 1 - 0.5 = 0.5

0.5 = Moles of water/ (Moles of solute + solvent) let Moles of water = x

0.5 = x/ 4.5 +x

0.5 (4.5 + x) = x

2.25 = 0.5 x

x = 4.5

Moles of solvent = 4.5 mole