Calculate the number of molecules in 10.92 g of CCl4?

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.