MHB Webpage title: Calculating Coulombs in a Nickel Coin

[leprofece]

How many Coulombs of charge positive and negative are there is a coin of 5 g of mass?
Answe: 2,3.105 C

I don't know but I have no idea I think there is no enough data

 

[Ackbach]

Do you know of what metal the coin is made?

 

[I like Serena]

How many Coulombs of charge positive and negative are there is a coin of 5 g of mass?
Answe: 2,3.105 C

I don't know but I have no idea I think there is no enough data

If we suppose that the coin is made of nickel, the atomic number is $28$ and the atomic mass is $58.7 \text{ u}$.

Therefore $5 \text{ grams}$ contains $\frac {5}{58.7} \text{ mol}$ in metal atoms.
Multiply by $N_A$ and we find $\frac {5}{58.7} \cdot 6.022\cdot 10^{23}\text{ atoms}$.
With 28 electrons that corresponds to:
$$\frac {5}{58.7} \cdot 6.022\cdot 10^{23} \cdot 28 \text{ electrons}$$
Convert to coulombs and we get:
$$\frac {5}{58.7} \cdot \frac{6.022\cdot 10^{23}}{6.241\cdot 10^{18}}\cdot 28 = 2.3\cdot 10^5 \text{ coulombs}$$

I think the coin is made of nickel! ;)