Answer
The total positive charge is $+1.36\times 10^5~C$
The total negative charge is $-1.36\times 10^5~C$
Work Step by Step
The molar mass of copper is 63.5 g/mol. We can find the number of moles $N$ of copper in one penny.
$N = \frac{3.1~g}{63.5~g/mol}$
$N = 0.04882~mol$
In one copper atom, there are 29 protons. We can find the total positive charge.
$q = (0.04882~mol)(6.02\times 10^{23}~atoms/mol)(29)(+1.6\times 10^{-19}~C)$
$q = +1.36\times 10^5~C$
The total positive charge is $+1.36\times 10^5~C$. Since the penny is electrically neutral, the total negative charge is $-1.36\times 10^5~C$
