Question

Prepare 250 mL of a 0.5 M aqueous sucrose solution. Calculate the mass of sucrose required for the 250 mL solution. The molecular weight of sucrose is 342.3g/mol

Answer 1

M = (w x 1000) / M_B x V (ml)

M = molarity of solution = 0.5 M

w = mass of solute = ?

V = volume of solution = 250 ml

M_B = molecular mass = 342.3 g/mol

w = M x M_B x V (ml) /1000

w = 0.5 x 342.3 x250 /1000

w= 42.788 g