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Before 1982, pennies were made of copper. From 1983 on

/in /by

Before 1982, pennies were made of copper. From 1983 on, they are made of zinc, and only thinly plated with copper. The purity of those pre-1982 pennies are really about 95% copper (5% zinc and tin), but from 1793-1837 they were actually pure copper. If you had a penny from 1820 that had a mass of 3.11 grams, how many atoms of copper would you have?

A.1.97
B.6.02 × 1023
C.2.95 × 1022
D.8.13 × 10-26
E.1.19 × 1026

 
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