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

Answer : The mass of NaCl added should be, 5.85 grams.

Explanation : Given,

Mass of = 250 g

Molality of solution = 0.40 mol/kg

Molar mass of = 58.5 g/mole

Molality : It is defined as the number of moles of solute present in one kilogram of solvent.

Formula used :

Now put all the given values in this formula, we get:

Therefore, the mass of NaCl added should be, 5.85 grams.

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hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b