What is the total positive or negative charge on a 3.11g of copper penny. Avogadro no. to be asumed as 6.02 * 10^23.

See, the total charge over the neutral Copper penny would be zero. that is,
Q_net = Q_e + Q_p  {where e and p are electrons and protons resp. ; Q_ep>0}
Individually, Q_e and Q_p can be calculated as follows:
The total number of electrons in an atom of Cu is 29
Given mass: 3.11 ; Molar mass: 63.5
Therefore, no. of moles of Cu = 3.11/63.5 = 0.049
So, total numbers of electron would be = 0.049*6.023*10²³*29 = N(say)
Hence, the toal charge due to N electrons is
Q_e = Ne {where e is the fundamental charge 1.6*10^-19}
     = 0.049*6.023*10²³*29*1.6*10^-19
     = 1.37*10⁵ C