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Sagot :
Answer:
0.365 m
Explanation:
The definition of molality is:
- molality = moles of solute / kg of solvent
First we calculate the moles of the solute, LiCl. We do so using its molar mass:
- 0.317 g ÷ 42.394 g/mol = 7.48x10⁻³ mol
Then we calculate the mass of the solvent, water. We do so using its density:
- 20.5 mL * 0.9982 g/mL = 20.5 g
- 20.5 g / 1000 = 0.0205 kg
Finally we calculate the molality of the solution:
- 7.48x10⁻³ mol / 0.0205 kg = 0.365 m
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