Total number of atoms represented by the compound $CuSO_4 \cdot 5H_2O$ is

Number of molecules in $100 \ mL$ of each of $O_2$,$NH_3$,and $CO_2$ at $STP$ are

If $10^{21}$ molecules are removed from $200 \ mg$ of $CO_2$,how many moles of $CO_2$ will remain?

The mass of $112 \ cm^3$ of $CH_4$ gas at $STP$ is ............. $g$.

Two flasks $A$ and $B$ of $500 \ mL$ each are filled with $O_2$ and $SO_2$ respectively at $300 \ K$ and $1 \ atm$ pressure. Then the flasks contain:

The total number of molecules of $SO_2Cl_2$ in $13.5 \ g$ of sulfuryl chloride is ..... (in terms of $N_A$) (in $N_A$)