A coke is 39g of sugar C6H1206 180 g/mol) is 355 mL of liquid. if the rest coke is water. The density coke solution is 1.026 g/mL. Determine molarity, molality, fraction, and percent of sugar in coke.

Answer 1

Moles sugar = 39 g / 180 g/mol = 0.217 mol

Volume of solution = 355 ml = 0.355 L

Mass of solution = 355 ml x 1.026 g/ml = 364 g

Mass of water = 364 g - 39 g = 325 g = 0.325 kg

Moles Water = 325 g /18 g/mol = 18 mol

Molarity = mol/L = 0.217 mol/ 0.355 L =0.61 M

Molality = mol/kg water = 0.217/0.325 = 0.67 m

Mole fraction = mol sugar/total mols = 0.217/0.217 + 18 = 0.011

Percent sugar by mass = 39 g/364 g (x100) = 11%