You have inherited ¼ mole of pennies. If you spent 1 × 1012 dollars every second how many decades would it take for you to spend your inheritance?
¼ mol × ( 6.02 x 1023 cents/1 mol) × ($1/100 cents) = 1.51 × 1021 dollars
1.51 × 1021 dollars × (1 sec/1 × 1012 dollars) × (1 min/60 sec) × (1 hr /60 min) × (1 day/24 hrs) × (1 yr/365 days) × (1 decade/10 yrs) = 4.79 decades.
Every mole contains 6.02 × 1023 units. That is a lot of pieces!