Suppose you have 4.00×1018reams of lead (Pb). How many lead atoms do you have? Express the number of atoms numerically.

Question

Suppose you have 4.00×1018reams of lead (Pb). How many lead atoms do you have?
Express the number of atoms numerically.

Answer 1

A ream is 500 atoms. So, if you have 1 ream of lead you have 500 atoms of lead. However, you have 4.0 x 10^18 reams which means you have 500 * 4.0 x 10^18 = 2.00 x 10^21 atoms of lead. Hope this helps!