The number of neutrons in $5 \ g$ of $D_2O$ ($D$ is $_1^2H$) are ................ $N_A$.

If the market prices of table salt $(NaCl)$ and table sugar $(C_{12}H_{22}O_{11})$ are $Rs. 4$ per $kg$ and $Rs. 30$ per $kg$ respectively,then the market price of $1$ mole of each will be,respectively,..... $Rs$.

The number of mole atoms and mole molecules in $56 \ L$ of oxygen gas at $STP$ are respectively:

The mass and volume of $1/4$ mole of oxygen gas at $STP$ are respectively .....

The number of oxygen atoms in $4.4 \ g$ of $CO_2$ is approximately:

Find the number of moles present in $0.448 \ L$ of dihydrogen at $STP$. (in $mol$)