Question

Pennies today are copper-covered zinc, but older pennies are 3.1 g of solid copper. What are the total positive charge and total negative charge in a solid copper penny that is electrically neutral?

Answer 1

`Q_+=1.36*10^5C`

`Q_+=-1.36*10^5C`

Step-by-step explanation:

From the question we are told that

Mass of old penny
`M=3.1g`

Generally the number of moles in a penny is given mathematically as

`n=(M)/(A)`

`A=atomic\ number\ of\ copper=>63.5g/mol`

Therefore

`n=(3.1)/(63.5)`

`n=0.049mol`

`Avogadro\ Number=(6.023*10^2^3 atom/mol`

Therefore

`N=(6.023*10^2^3 atom/mol *0.049mol`

`N=2.939*10^2^2atoms`

Generally the Total positive charge of the copper is given by

Since its the 29th atom of the periodic table

29 protons

29 electrons

`Q_+=29(2.939*10^22)(1.6*10^1^9)`

`Q_+=1.36*10^5C`

Generally the Total negative charge of the copper is given by

`Q_+=29(2.939*10^22)(-1.6*10^1^9)`

`Q_+=-1.36*10^5C`