Answer:
Option D
Explanation:
Given, W (mass of solute) =5.0 g
m (molar mass of solute)=40 g mol-1
Volume=100 mL
Molarity is given as,
M= Moles of solute/ Volume of solution (in L)
M= W x 1000/ m x volume of solution (in mL)
=5.0g×100040×100
=1.25 mol dm−3