Question

ФИЗИКА, 20 БАЛЛОВ!!! Дана медная монетка массой m = 10г. Нужно вычислить заряд всех свободных электронов. В M=64г меди содержится N=6,02*10^23 атомов. Количество атомов равно количеству электронов.

Answer 1

Дано   m=10г  M=64 г/моль    q- ?

так как медь в 1 группе то на 1 атом приходится один валентный электрон

N=v*Na=m*Na/M=10*6,02*10^23/64=0,94*10^23

q=e*N=1,6*10^-19*0,94*10^23=1.5*10^4 Кл

Ответ q=1,5*10^4 Кл

Answer 2

Calculation of the Charge of Free Electrons in a Copper Coin

To calculate the charge of all the free electrons in a copper coin, we need to know the number of free electrons and the charge of each electron.

Given: - Mass of the copper coin, m = 10 g - Mass of copper, M = 64 g - Avogadro's number, N = 6.02 x 10^23 atoms

We can use the molar mass of copper to find the number of moles of copper in the coin, and then use Avogadro's number to find the number of atoms in the coin.

The molar mass of copper (Cu) is 63.55 g/mol. Therefore, the number of moles of copper in the coin is:

moles of copper = mass of copper / molar mass of copper moles of copper = 64 g / 63.55 g/mol

To find the number of atoms in the coin, we multiply the number of moles of copper by Avogadro's number:

number of atoms = moles of copper x Avogadro's number number of atoms = (64 g / 63.55 g/mol) x (6.02 x 10^23 atoms/mol)

Since the number of atoms is equal to the number of electrons in a neutral atom, we can conclude that the number of free electrons in the coin is also equal to the number of atoms.

Now, to calculate the charge of each electron, we can use the elementary charge (e), which is approximately 1.6 x 10^-19 C.

Therefore, the charge of all the free electrons in the copper coin is:

charge of all electrons = number of free electrons x charge of each electron charge of all electrons = (number of atoms) x (charge of each electron)

Let's calculate the charge of all the free electrons in the copper coin using the given values:

1. Calculate the number of atoms: - moles of copper = 64 g / 63.55 g/mol - number of atoms = (64 g / 63.55 g/mol) x (6.02 x 10^23 atoms/mol)

2. Calculate the charge of all electrons: - charge of all electrons = (number of atoms) x (charge of each electron)

Please note that the charge of each electron is a well-known constant, and the number of atoms in the coin can be calculated using the given mass of copper and Avogadro's number.