Question

in a binary solution of methyl alcohol and water, if the mass of methyl alcohol and water is 48 g and 81 g respectively, then the mole fraction of methyl alcohol in the solution is

Answer 1

Methyl chloride is classified as a, Division 2.1, flammable gas under US Department of Transportation regulations. The appropriate DOT identification number is UN1063.Methyl chloride is generally stable when dry. In the presence of moisture,methyl chloride hydrolyzes to form corrosive hydrochloric acid.

Answer 2

Mass of the Methanol = 60 g.
Molar mass of the Methanol = 32 g/mole.

∵ No. of moles of Methanol = Mass/Molar Mass.
∴ No. of moles = 60/32
  = 1.875 mole.

Mass of the Water = 120 g.
Molar mass of the water = 18 g/mole.

No. of moles of Water = Mass/Molar mass.
   = 120/18
   = 6.67 mole.

Now, Total number of moles in a solution = No. of moles of Methanol + No. of moles of water.
 = 1.875 + 6.67
 =  8.545 moles.

Mole Fraction of Water in the solution = No. of moles of water/Total number of moles in a solution.
 = 6.67/8.545
 = 0.78