The number of moles of a gas in $1 \, m^3$ of volume at $NTP$ is

Calculate the number of atoms of oxygen present in $176 \ g$ of $CO_2$.

$A$ sample of $[Cu(NH_3)_4]SO_4$ contains $2.4 \times 10^{24}$ ammonia molecules. The moles of $[Cu(NH_3)_4]SO_4$ in the given sample will be:

If one atom of an element $X$ weighs $6.643 \times 10^{-23} \ g$,then find the number of moles of atoms in $50 \ kg$ of element $X$. (in $moles$)

Which of the following is the Loschmidt number?

If $1 \, mL$ of water contains $20$ drops,then the number of molecules in $1$ drop of water is: