If we dissolve 55g of sugar (C12H22O11) in. 800 Liters of solution, what is the Molarity?

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