Suppose you have 3.50×10^18 reams of lead (Pb). How many lead atoms do you have?

1 ream=500

If you take a ream to be 500 atoms, then you have 500 x 3.50 x 10^18 = 1750 x 10^18 = 1.75 x 10^21 atoms.
However, take note that a ream is NOT 500 atoms, it is 500 sheets of paper.

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