Question

A solution contains 10.0 g pentane, 10.0 g hexane and 10.0 g benzene. What is the mole fraction of hexane?

Answer 1

Answer:

0.384

Explanation:

Mass of pentane = 10 g.

Molar mass of pentane(C5H12) = 5×12+12×1=72.

Mass of hexane = 10 g

Molar mass of hexane(C6H14) = 6×12+14×1=86.

Mass of benzene = 10 g.

Molar mass of benzene(C6H6) =6×12+6×1=78.

Moles of pentane = 10/72 = 0.138

Moles of hexane = 10/86 = 0.166

Moles of benzene = 10/78 = 0.128

Total moles = 0.138+0.166+0.128 = 0.432

Mole fraction of hexane = 0.166/0.432 = 0.384

GOD BLESS THE PRINCESS