A solution of glucose in water is labelled as 10 percent `W/W`. If the density of the solution is `1.2 g mL^(-1)`, then what shall be the molarity of the solution ?

Options

A. 0.17 M
B. 0.67 M
C. 0.6 M
D. 0.76 M

Answer

B

Explanation

mol of glucose = 180 10% `(W/W)` solution of glucose means 100 g solution contains 10 g glucose.
Molarity `=("moles of solute")/("volume of solution (mL)" xx 1000) = (10/180)/(100/1.2) xx 1000 M`
`= (10 xx 1.2 xx 1000)/(180 xx 100) = 0.67 M`