Chemistry
posted by Eliza .
A mole of pennies stackd on top of one another would reach from here to the sun and back how many times?

Need more information:
1. average thickness of penny
2. distance from earth to sun
3. you need to understand avogadros number. (6.0221415 × 10^23) Then it becomes a simple math problem. 
but then what after you get that info?

2.918 billion pennies
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