we need to use the following formula:
Molarity = moles/ liters
1) we need to determine the moles by converting the grams to moles using the molar mass
molar mass C₁₂H₂₂O₁₁= (12 x 12.0) + (22 x 1.01) + (11 x 16.0)= 342 g/mol
55 g sugar (1 mol/ 342 g)= 0.161 moles
2) plug in the values into the molarity formula
molarity= 0.161 mol/ 0.800 Liters= 0.201 M