At $NTP$,the density of a gas,whose molecular weight is $45$,is ............. $g \ L^{-1}$.

How many moles of $H_2O$ are liberated when one mole of hydrated $MgCl_2$ is heated?

Combustion of glucose $(C_6H_{12}O_6)$ produces $CO_2$ and water. The amount of oxygen (in $g$) required for the complete combustion of $900 \ g$ of glucose is:
[Molar mass of glucose in $g \ mol^{-1} = 180$]

To neutralize $10 \, mL$ of $M/5$ $NaOH$,the volume of $M/20$ $HCl$ required is......$mL$.

What is the value of percent atom economy when an organic compound of formula weight $75 \ u$ is obtained from reactants having sum formula weight $225 \ u$?

The molecular weight of a gas is $45$. Its density at $STP$ is