How do you calculate atoms 6PCl5?

To calculate the total number of atoms in 6PCl₅, first note that each molecule of PCl₅ contains one phosphorus (P) atom and five chlorine (Cl) atoms. Therefore, in 6PCl₅, you have 6 phosphorus atoms and (6 \times 5 = 30) chlorine atoms. Adding these together gives a total of (6 + 30 = 36) atoms in 6PCl₅.