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How much ethylene glycol (C2H6O2, the major component of antifreeze) must be added to 1 L of water to keep from it freezing at -15 °F?

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  1. Change -15F to degrees C. That's approximately -26
    Then delta T = Kf*m
    approx 26 = 1.86*m
    solve for molality.
    m = mols/kg solvent = mols/1kg
    You have m and kg, solve for mols.
    Then mol = g/molar mass. You have molar mass and mols, solve for g

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  2. 14 mols/kg

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