For an ideal solution containing a non-volatille solute, which of the following expression is correct represented?
where m is the molality of the solution and`K_(b)`is molal elevation constant.
A. `DeltaT_(b)=K_(b)xxm`
B. `DeltaT_(b)=K_(b)xxM`
C. `DeltaT_(b)=K_(b)xx2m`
D. `DeltaT_(b)=K_(b)xx2M`