If 1mol ------- is ----------- 6,02×10²³
so x ------- is ----------- 1,39×10²⁴
Answer:
The right answer to this is (b)
Answer:
0.365 m
Explanation:
The <em>definition of molality</em> is:
- molality = moles of solute / kg of solvent
First <u>we calculate the moles of the solute, LiCl</u>. We do so using its <em>molar mass</em>:
- 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 <em>density</em>:
- 20.5 mL * 0.9982 g/mL = 20.5 g
- 20.5 g / 1000 = 0.0205 kg
Finally we <u>calculate the molality of the solution</u>:
- 7.48x10⁻³ mol / 0.0205 kg = 0.365 m
