Question

What is the mole fraction of water in a solution that is 36.8 % by weight ethylene glycol? The molar mass of ethylene glycol, HOCH₂CH₂OH, is 62.07 g/mol.

Answer 1

36.8 % by weight ethylene glycol means 36.8 grams of ethylene glycol present in 100 grams of water.

moles of ethylene glycol = (36.8 g ethylene glycol) / (62.07 g/mol) = 0.592879 mol ethylene glycol

moles of water = (100 - 36.8 g) / 18.02 g/mol = 3.5072 mol water

mole fraction of water = moles of water / Total moles = 3.5072 / [0.592879 + 3.5072) = 0.85

mole fraction of water = 0.85

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