What mass of propylene glycol is dissolved in water

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Problem- Propylene glycol (C6H8O2 , molar mass 76.09 g/mol) is a commonly used in anti-freeze for its lower toxicities in comparison to ethylene glycol. Assuming the freezing point of a solution decreases by -18.6°C, what mass of propylene glycol is dissolved in 1L of water. The molal freezing point depression constant for water is 1.86°C kg/mol

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