Question

calculate the number of electrons in 12g urea❓​

Answer 1

Given:

12 gram of urea.

To find:

Number of electrons in the given sample?

Calculation:

First of all, let's calculate the number of moles in given sample:

$\rm \: moles = \dfrac{given \: mass}{molar \: mass}$

$\rm \implies\: moles = \dfrac{12}{60}$

$\rm \implies\: moles = 0.2$

Now , number of molecules in the given sample:

$\rm \implies\: molecules = 0.2 \times 6.023 \times {10}^{23}$

$\rm \implies\: molecules = 1.2046 \times {10}^{23}$

• Now, electrons in 1 molecule of urea is (7 + 7 + 4 + 8 + 6) = 32 electrons.

So, electrons in given number of molecules is :

$\rm = 32 \times (molecules)$

$\rm = 32 \times 1.2046 \times {10}^{23}$

$\rm = 38.54 \times {10}^{23} \: electrons$

So , total number of electrons is 38.54 × 10²³ electrons.