If you had 50.21 grams of NaCl and you dissolved it in exactly 2.00 kg of water. What would be the molality of the solution?

The answer to your question is molality = 0.43

Explanation:

Data

mass of NaCl = 50.21 g

mass of water = 2 kg

Process

1.- Convert the mass of NaCl to moles

Molar mass of NaCl = 23 + 35.5 = 58.5 g

                              58.5 g of NaCl 1 mol

                              50.21 g of NaCl  x

                               x = (50.21 x 1) / 58.5

                               x = 0.86 moles

2.- Calculate the molality

molality = moles / mass of solvent

-Substitution

molality = 0.86 / 2

-Result

molality = 0.43

b is the correct answer

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