question_answer

When \[{{W}_{B}}gm\] solute (molecular mass \[{{M}_{B}}\]) dissolves in \[{{W}_{A}}gm\] solvent. The molality \[M\] of the solution is

A)                 \[\frac{{{W}_{B}}}{{{W}_{A}}}\times \frac{{{M}_{B}}}{1000}\]           

B)                 \[\frac{{{W}_{B}}}{{{M}_{B}}}\times \frac{1000}{{{W}_{A}}}\]

C)                 \[\frac{{{W}_{A}}}{{{W}_{B}}}\times \frac{1000}{{{M}_{B}}}\]           

D)                 \[\frac{{{W}_{A}}\times {{M}_{B}}}{{{W}_{B}}\times 1000}\]