Question

a solution contains 90 gm of H2O , 6.4 gm of methanol and 18.4 gm of glycerol . what is the mole fraction of glycerol.​

Answer 1

Answer:

90 h20ks 18.4 92.34 67.828 2.28

Answer 2

Given,

• Mass of H₂O = 90 g  → solvent

• Mass of Methanol = 6.4 g  → solute₍₁₎

• Mass of Glycerol = 18.4 g  → solute₍₂₎

We know,

$\bf Number \:of \:moles = \dfrac{Given\:Mass}{Molar mass}$

So,

• $\sf Number \:of \:moles \:of \:glycerol = \dfrac{18.4}{92}=0.2$

• $\sf Number \:of \:moles \:of \:water = \dfrac{90}{18}=5$

• $\sf Number \:of \:moles \:of \:methanol = \dfrac{6.4}{32}=0.2$

Therefore,

$\sf Mole \:fraction \:of \:glycerol = \dfrac{0.2}{0.2+5+0.2}$

$\implies \sf Mole \:fraction \:of \:glycerol = 0.037$

$\huge\boxed{\bf Mole \:fraction \:of \:glycerol = 0.037}$