We know from the molecular mass that
1 mole of C#Cl_4# = 154 g/ mol , and we can use this information to make a conversion factor. In this case, first we are converting from grams to moles and then from moles to number of molecules.
1 mol of C#Cl4# has mass 154 g/mol
154 g of C#Cl4# makes 1 mol of C#Cl_4#
1g of C#Cl_4# makes #( 1 // 154 )# moles
10.92 g of C#Cl_4# makes 10.92 #( 1 // 154 )# moles
10.92 g of C#Cl_4# makes 0.0709 moles
1 mole of C#Cl_4# has 6.02 x #10^ 23 # molecules
0.0709 moles of C#Cl_4# has ( 6.02 x #10^ 23 # ) x 0.0709 molecules
0.0709 moles of C#Cl_4# has molecules 0.426 x #10^ 23 # molecules.
