If you stacked avogadro's number of pennies one on top of the other on earth's surface, how far would the stack extend (in kilometers)?

A penny is described as a coin having thickness of about 0.019 m as follows:

b i think it’s a water wheel turning in a stream

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.