Question

how many gram of water must be used to dissolved in 50 gm of sucrose to prepare a 1.25m solution of sucrose?

Answer 1

Molar concentration c is given by

$c = \frac{n}{v} = \frac{m}{MV}$

and $V = \frac{m}{cM}$

Molar mass of sucrose is 342.3 g/mol

V = 50 ÷ (1.25 x 342.3)

= 0.117 L

m = 0.117 kg = 117 g