Question

Calculate mole fraction of each component when 5 gram of chloroform is dissolved in 45 grams of ethanol

Answer 1

Mole fraction:

Mole fraction is a ratio of mole of solute or solvent to the total number of moles (mole of solute + moles of solvent) or number of mole of solution.

Number of moles = amount in g / molar mass

Chloroform  

Number of mole  = 5 g / 119.38 g/mol

=0.042 moles

Moles of ethanol = 45 g/ 46.08 g/ mole

= 0.98 moles

Total number of  mole s= 0.042+ 0.98 mole s= 1.022 moles

Mole fraction of CHCl3 = 0.042 /1.022= 0.041  

Mole fraction of C2H5OH = 0.98 /1.022= 0.959