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

If $5.85 \ g$ of $NaCl$ are dissolved in $90 \ g$ of water,the mole fraction of $NaCl$ is

The number of molecules of $CO_2$ present in $44 \ g$ of $CO_2$ is

$1 \ mL$ of water has $25$ drops. Let $N_0$ be the Avogadro number. What is the number of molecules present in $1$ drop of water? (Density of water $= 1 \ g / mL$)

Explain: Avogadro's Law.

Which of the following has the minimum number of atoms?