Consider two isotonic solutions at same temperatures The solute in the solution A has the molecular mass M and - Chemistry - Pure substances and mixtures

Question

Consider two isotonic solutions at same temperatures The solute
in the solution A has the molecular mass M and the solute in the
solution B has the molecular mass 2M If the volume of both the
solution is same; then, which of the following statements is
correct?
Options

The number of the moles of solutes in A and B are same

The mass of the solute in A and B is same

The number of the moles in solution A is double the number of
the moles in solution B

The number of the moles in solution B is double the number of
the moles in solution A

Kumar Sarang · Accepted Answer

To make isotonic No of mole of solute should be same in both
solutions i e
nA = nB
n = weigth of solute / molar mass of solute
Solution A has the molecular mass M for solute
Solution B has the molecular mass 2M for solute

WA/M = WB/2M
2WA/M=WB/M

OR
2nA= nB

Correct Answer : D
The number of the moles in solution B is double the number of the
moles in solution A