Which of the following concentration terms depends on temperature?

If the mole fraction of the solute in benzene is $0.2$,then the molality of the solution will be ..............

The molality of $648 \ g$ of pure water is .................. $m$.

State whether the following sentences are true $(T)$ or false $(F)$.
$(a)$ Concentration of pure water is $1.0 \ mol \ L^{-1}$.
$(b)$ Concentration of pure water is $55.5 \ mol \ L^{-1}$.

The molecular weight of urea is $60$. $A$ solution of urea containing $6 \ g$ of urea in one litre is ....... $molar$.

The molality of $648 \ g$ of pure water is ........... $m$.