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What is the molality of NaCl formula units in an aqueous solution if the boiling point...

What is the molality of NaCl formula units in an aqueous solution if the boiling point of the solution is 102.10 °C at 1 atm. (Water has a boiling point elevation constant of 0.51 °C kg/mol.)

A) 4.1 m
B) 0.49 m
C) 8.2 m
D) 2.1 m

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