Question

calculate the mole fraction of glycerol solution in 25% by weight of glycerol ​

Answer 1

25% by mass means 25g of glycerol in 100g water.

ie; given mass of glycerol = 25g

molar mass of glycerol = 92g

no: of moles of glycerol = given mass/

moleclr mass

= 25÷92=0.27

given mass of solvent =100-25=75g

molecular mass of water = 18g

therefore,no of moles = 75÷18=4.16

molefraction = 0.27÷(0.27+4.16)

=0.06

Answer 2

Answer:

Given that :

w = mass of glycerol = 25 gm

m = molecular mass of glycerol = 92 gm

W = mass of solvent which in our case is water = 100 -25 = 75 gm

M = molecular mass of solvent = 18 gm

we know that -

mole fraction = w÷m/w÷m+W÷M

=25÷92/25÷92+75÷18

mole fraction = 0.06