Question

Calculate the no. of electrons in 100g of co2

Answer 1

Molar mass of carbondioxide =12+2×16 = 44g. So, No. of mole in 100 g of CO2 =weight/Molar mass = 100/44 =2.27 mol. No. of molecules in CO2 = 2.27 × Avogadros number. So, Total number of electrons in 100 g of CO2 =22×2.27×Avogadros number =49.94 ×Avogadros number.p

Answer 2

Answer : The number of electrons in 100 g of $CO_2$ is $3.0\times 10^{25}$ electrons.

Solution : Given,

Mass of $CO_2$ = 100 g

Molar mass of $CO_2$ = 44 g/mole

First we have to calculate the moles of $CO_2$.

$\text{ Moles of }CO_2=\frac{\text{ Given mass of }CO_2}{\text{ Molar mass of }CO_2}=\frac{100g}{44g/mole}=2.27moles$

1 mole of $CO_2$ has $6.022\times 10^{23}$ molecule of $CO_2$

2.27 moles of $CO_2$ has $(6.022\times 10^{23})\times 2.27=13.67\times 10^{23}$ molecule of $CO_2$

Now we have to calculate the number of electrons in $CO_2$.

The number of electrons present in 1 molecule of $CO_2$ is,

Number of electrons = 6 + 2(8) = 22 electrons

Number of electrons present in 1 molecule of $CO_2$ = 22

Number of electrons present in $13.67\times 10^{23}$ molecule of $CO_2$ = $22\times 13.67\times 10^{23}=3.0\times 10^{25}$ electrons

Therefore, the number of electrons in 100 g of $CO_2$ is $3.0\times 10^{25}$ electrons.