Question

Calculate the number of molecules
in 11.2 litre of so2 gas at stp

Answer 1

$\huge{\mathbb{ANSWER\::-}}$

♦As in the questions it is asked to find out the number of molecules in 11.2 litred solution of $SO_2$ gas at STP .

♦ So , before start solving we must know that :-

• At STP any One mole Ideal gas acquires 22.4 litres of volume

• One mole = $6.023 \times 10^{23}$ molecules of substance = $N_A$ Number of molecules .

♦ Then from above information :-

• Moles of $SO_2$ gas

$= \dfrac{\texttt{Volume of gas}}{\texttt{Volume of one mole gas at STP}}$


$= \dfrac{11.2}{22.4} \\\\ = \dfrac{1}{2} \: Moles$


• No. of molecules

= No. of moles × $N_A$

$= \dfrac{1}{2} \times 6.023 \times 10^{23}$

$= 3.0115 \times 10^{23}$

♦ So there are $3.0115 \times 10^{23}$ molecules of in 11.2 litres of gas $SO_2$ .