Question

Calculate the number of electrons in36 gm water

Answer 1

18 gram of water equals to 1 mole of water .
so 36 gram of water equals to 2 moles of water
2 moles of water equals 12.044*10^23 atoms.
1 atom of water contains 10 electrons.
So 36 g water contains 12.044*10^24 electrons.

Answer 2

Answer: The number of electrons in given amount of water is $12.044\times 10^{24}$

Explanation:

The chemical formula for water is $H_2O$

Number of electrons in oxygen atom = $1s^22s^22p^4$ = 8

Number of electrons in hydrogen atom = $1s^1$ = 1

Total number of electrons in water = (8 + 1 + 1) = 10

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of water = 32 g

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

$\text{Number of moles}=\frac{32g}{18g/mol}=2mol$

According to mole concept:

1 mole of an compound contains $6.022\times 10^{23}$ number of molecules or electrons or protons or neutrons.

So, 2 moles of water will contain = $10\times 2\times 6.022\times 10^{23}=12.044\times 10^{24}$ number of electrons.

Hence, the number of electrons in given amount of water is $12.044\times 10^{24}$