What is the mole fraction of glycerin C3H5(OH)3 in a solution containing  33 g of glycerin, 60 g isopropyl alcohol and rest water?

Mw of glycerin =92 g/mol 

Number of moles of glycerin  

=33/92=0.3587 mol 
Number of moles of isopropyl alcohol  

=60g/(60 g/mole)=1 mole 
Number of moles of water  

=7 g/(18 g/mole)=0.3889 mole 
Mole fraction of glycerin  

=0.3587/(0.3587+1+0.3889) =0.205