Calculate the total number of atoms in $5.6 \ L$ of $SO_2$ gas at $NTP$.

What is the number of moles of $Cl$ atoms and $N$ atoms respectively present in $n$ moles of tear gas?

$6.02 \times 10^{20}$ molecules of urea are present in $100 \ mL$ of its solution. The concentration of solution is $.... M$.

The number of moles of water present in a spherical water droplet of radius $1.0 \ cm$ is,(Given: Density of water in the droplet $= 1.0 \ g \ cm^{-3}$)

$2.8 \times 10^{-3} \ mol$ of $CO_2$ is left after removing $10^{21}$ molecules from its '$x$' $mg$ sample. The mass of $CO_2$ taken initially is. Given: $N_A = 6.02 \times 10^{23} \ mol^{-1}$. (in $mg$)

How many $H$ atoms are present in $0.46 \, g$ of ethanol $[C_2H_5OH]$?