How many grams of nacl should be added to 250 grams of waterto
make a 0.40 m solution?

5.85 grams of NaCl should be added to 250 grams of water to  make a 0.40 m solution.

Explanation:

Mass of NaCl =x

Molar mass of NaCl = 58.5 g/mol

Molality of the solution = 0.40 m

Mass of the solvent = 250 g = 0.250 kg (1g = 0.001 kg)

5.85 grams of NaCl should be added to 250 grams of water to  make a 0.40 m solution.

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.