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  2. Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.
# NCERT

2.2   Calculate the mole fraction of benzene in solution containing 30\% by mass in carbon tetrachloride.

Answers (1)
D Devendra Khairwa

For calculating mole fraction, we need moles of both the compounds.

It is given that benzene is 30\% in the solution by mass.

So if we consider 100g of solution then 30g is benzene and 70g is CCl4.

                                            Moles of CCl_{4}= \frac{Given\ mass}{Molar\ mass} = \frac{70}{154} = 0.4545\ mol                                                     

\left ( Molar\ mass\ of\ CCl_4 = 12 + 4(35.5) \right )

Similarly moles of benzene :

                                                     = \frac{30}{78} = 0.3846                                                                                    \left ( Molar\ mass\ of\ benzene = 6(12) + 6(1) \right )   

So mole fraction of benzene is given  :

                                                                  = \frac{0.3846}{0.3846+0.4545}

                                                                  = 0.458  

                                   

 

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