2.1 Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

 

Mass percentage of C6H6=MassofC6H6Totalmassofthesolution×100

=MassofC6H6MassofC6H6+MassofCCl4×100
=2222+122×100
=15.28%

Mass percentage of CCl4=MassofCCl4Totalmassofthesolution×100
=12222+122×100
=84.72%

Alternatively,

Mass percentage of CCl4 = (100 − 15.28)% = 84.72%