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Calculate the total positive or negative charge on a 3.11g copper penny. Given Avogadro number =6.02×1023, atomic number of copper =29 and atomic mass of copper =63.5
A. 3.37×105C
B. 2.37×105C
C. 1.37×105C
D. 0.37×105C

Answer
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Hint:In order to solve this question you have to find the total positive or negative charge on a 3.11g copper penny. Firstly, you have to calculate the total number of atoms in the given amount of copper.

Complete step by step solution:
It is given in the question that the mass of the copper penny =3.11g
The atomic number of the copper is also given =29
And the atomic mass of the copper =63.5
We know that the Avogadro number =6.02×1023
In this question you have to calculate the total positive or negative charge on a 3.11g copper penny.
In order to do so, firstly you have to calculate the total number of atoms in 3.11g of copper, which is given by,
We know that the total number of atoms in 63.5g of copper =6.02×1023
Hence, total number of atoms in 3.11g of copper =3.1163.5×6.02×1023

=0.295×1023

Since, we know one atom of copper contains =29 electrons or protons.
So, 0.295×1023 atoms contain =29×0.295×1023 electrons or protons.
As we also know that the charge on one electron or proton =1.6×1019C
the total positive or negative charge on a the given amount of copper =29×0.295×1023×1.6×1019C

=1.368×105C

So, the total positive or negative charge on a 3.11g copper penny is 1.37×105C approx.
Therefore, the correct option is (C).

Note:Always remember that the Avogadro’s number is defined as the number of units in one mole of any substance. It is the proportionality factor and is related to the number of constituent particles in a sample with the amount of substance in that sample. Also remember that the amount of charge on one electron and proton is the same in magnitude.