“how many atoms are in 1.75 mol of chcl3?

How many atoms are in 1.75 mol of CHCl3?

One mole is always equal to 6,02*10²³ atoms of molecules, therefore:

1mol → 6,02*10²³ atoms of molecules
1,75mol → x

x = 1,75*6,02*10²³
x = 10,535*10²³ or 

1 molecule de CHCl3 ------ 5 atoms (1C, 1H, 3Cl)
1,05*10^24 -------------------- y 

The answer is letter c