Question

Asked Dec 10, 2019

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If 500. g of water is added to a 75 g of a 2.5 molality NaCl solution, what is the mass percent of NaCl in the diluted solution?

Step 1

Given:

Mass of water is 500 g.

Mass of NaCl is 75 g.

Molality of NaCl is 2.5

Step 2

It is known, 1 g = 0.001 kg

Therefore, mass of NaCl in kg is 0.075 kg.

The mathematical expression of molality is,

Step 3

Substitute the given value of molality and weight...

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