Practicing Success
Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride? Molar mass of benzene = 78 g /mol ; Molar mass of carbon tetrachloride = 154 g/mol |
0.384 0.4545 0.5 0.458 |
0.458 |
Assume that the mass of benzene be 30g in the total mass of the solution of 100g. Then mass of CCl4 = 100g - 30g = 70g Number of moles of benzene = \(\frac{mass}{\text{molar mass}}\) = \(\frac{30g}{78g mol^{-1}}\) = 0.3846 mol Number of moles of CCl4 = \(\frac{mass}{\text{molar mass}}\) = \(\frac{70g}{154 gmol^{-1}}\) = 0.4545 mol Therefore mole fraction of benzene = \(\frac{\text{Number of moles of benzene}}{\text{ Number of moles of benzene+ Number of moles of CCl4}}\) = \(\frac{0.3846}{0.3846 + 0.4545}\) = 0.458 |