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

Calculate the number of molecules present in $2.24 \text{ dm}^3$ of carbon dioxide $(CO_2)$ at $STP$.

The largest number of molecules is in

$A$ thin layer of cobalt is deposited on a plate with a total area of $0.5 \ m^2$ and a thickness of $0.005 \ cm$. How many cobalt atoms are deposited on the plate? (Density of cobalt $= 8.9 \ g \ cm^{-3}$,Atomic mass of $Co = 59 \ g \ mol^{-1}$)

Which of the following represents $180 \ g$ of water correctly?

What is the mass in $kg$ of $5$ mole of acetic acid $(mol. mass = 60 \ g \ mol^{-1})$ (in $kg$)?