calculate the mole fraction of benzene in solution containing 30 percentage by mass in carbon tetrachloride
Answers
0.4583(approx.)
Given:
30 % of benzene in tetrachloride
To Calculate:
Mole fraction of Benzene
Solving:
Calculating the molecular mass of Benzene Formula (C6H6)
= 12 g x 6 + 1 g x 6
= 72 + 6
= 78 g mol^-1
Calculating the molecular mass of Carbon Tetrachloride (CCl4)
= 12 g x 1 + 35.5 g x 4
= 12 + 142
= 154 g mol^-1
Let us assume the solution to have a weight of 100 grams
Mass of ethylene glycol = 30 grams
Calculating the mass of solvent = 100 - 30 = 70 grams
Number of moles of solute
= Mass of solution / Molecular mass of soln.
= 30 / 78
= 0.3846 mol
Calculating number of moles of solvent Carbon Tetrachloride
= 70 g / 154 g
= 0.4545 mol
Calculating total number of moles:
= 0.4545 + 0.3846
= 0.8391 mol
Calculating the mole fraction:
= nB/(nA + nB)
= 0.3846/ 0.8391
= 0.4583
Therefore, the mole fraction of Benzene is 0.4583(approx.)