Question

How many moles are in 9.461 * 10^24 formula units of manganese(iii) dichromate?

Answer 1

1 mole ------------- 6.02x10²³ molecules
?? moles ---------- 9.461x10²⁴ molecules

1  x ( 9.461x10²⁴ ) / 6.02x10²³ =

9.461x10²⁴ / 6.02x10²³ => 15.71 moles

hope this helps!