How many atoms are in 1.4 mol of phosphorus trifluoride (PF3)?

1.4 mol of phosphorus trifluoride (PF3) would contain 8.4 x 10^23 molecules, since each molecule of PF3 contains 4 atoms (1 phosphorus atom and 3 fluorine atoms). So, there would be 33.6 x 10^23 atoms in 1.4 mol of PF3.