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What mass, in grams, of NaCl needs to be added to 2.7kg of water in order to create a solution with a freezing point of

What mass, in grams, of NaCl needs to be added to 2.7kg of water in order to create a solution with a freezing point of -6.4 "C? The freezing point depression constant of water is 1.86C/m. Type

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