Mole fraction of a solute

What is mole fraction of a solute? This is the ratio of number of moles of the solute to the total number of moles present in the solution. In general we can say that
Mole fraction of the solute= Number of moles of the solute/Total number of moles present in the solution
For example : Do you know how to calculate the mole fraction of CH₃OH in a solution which contains 64gram of CH₃OH in 144 gram of H₂O?

• CH₃OH is methanol. So mole fraction of methanol is calculated using the above equation. That means number of moles of solute= 64/32=2
• Total number of moles present in the solution=( 64/32) + (144/18) = 2+8=10
• Mole fraction of methanol=2/10=0.2