J.R. S. answered 02/28/22
Ph.D. University Professor with 10+ years Tutoring Experience
1 mole of anything = 6.022x1023 of those items. Using this value (Avogadro's number) and dimensional analysis, we can answer the question as follows:
A). 1 mol of dimes x 6.022x1023 dimes / mole x $0.1 / dime = $6.022x1022
B). 7.1 billion = 7.1x109
$6.022x1022 / 7.1x109 people = $8.5x1012 per person
C). Each person would be a millionaire, a billionaire and a trillionaire. They'd each have 8.5 trillion dollars.