Question

When 2.0 mol of methanol is dissolved in 45 grams of water, what is the mole fraction of methanol

Answer 1

The mole fraction of methanol in the mixture is 0.444

We'll begin by calculating the number of mole of water.

• Mass of water = 45 g

• Molar mass of water = 18 g/mol

• Mole of water =?

Mole = mass / molar mass

Mole of water = 45 / 18

Mole of water = 2.5 moles

Finally, we shall determine the mole fraction of methanol.

• Mole of water = 2.5 moles

• Mole of methanol = 2 moles

• Total mole = 2 + 2.5 = 4.5 moles

Mole fraction of methanol =?

Mole fraction = mole / total mole

Mole fraction of methanol = 2 / 4.5

Mole fraction of methanol = 0.444

Thus, the mole fraction of methanol is 0.444

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