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garri49 [273]
3 years ago
13

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?
Physics
1 answer:
k0ka [10]3 years ago
7 0

Answer:

Q_+=1.36*10^5C

Q_+=-1.36*10^5C

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=\frac{M}{A}

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

Therefore

n=\frac{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

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