Question

A solution is made using 65.1 g of hexane (MM = 86.18 g/mol) and 60.0 g of octane (MM = 114.2 g/mol). What is the mole fraction of the hexane in the solution?

Answer 1

The mole fraction of the hexane in the solution is 0.59

Data obtained from the question

• Mass of hexane = 65.1 g
• Molar mass of hexane = 86.18 g/mol
• Mass of octane = 60 g
• Molar mass of octane = 114.2 g/mol
• Mole fraction of hexane =?

Determination of mole of hexane

• Mass of hexane = 65.1 g
• Molar mass of hexane = 86.18 g/mol
• Mole of hexane =?

Mole = mass / molar mass

Mole of hexane = 65.1 / 86.18

Mole of hexane = 0.755 mole

Determination of mole of octane

• Mass of octane = 60 g
• Molar mass of octane = 114.2 g/mol
• Mole of octane =?

Mole = mass / molar mass

Mole of octane = 60 / 114.2

Mole of octane = 0.525 mole

How to determine the mole fraction of hexane

• Mole of hexane = 0.755 mole
• Mole of octane = 0.525 mole
• Total mole = 0.755 + 0.525 = 1.28

• Mole fraction of hexane =?

Mole fraction = mole / total mole

Mole fraction of hexane = 0.755 / 1.28

Mole fraction of hexane = 0.59

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