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adoni [48]
3 years ago
6

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

Chemistry
1 answer:
brilliants [131]3 years ago
7 0

Answer:

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

Explanation:

molality=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{ Mass of solvent (kg)}}

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)

0.40 m=\frac{x}{58.5 g/mol\times 0.250 kg}

x=0.40 m\times 58.5 g/mol\times 0.250 kg=5.85 g

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

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