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A solution is made by dissolving 1.00 m of sodium chloride (NaCl) in 155 grams of water. If the molar boiling point constant for water (kb) is 0.51 C/m what would be the boiling point of this solution?

Respuesta :

Edufirst
Answer: 106.58°C

1) Data

- solute: NaCl
- n solute = 1.00 moles
- solvent: water
- grams of solvent = 155 g
- kb = 0.51 °C / m
- Tb ?

2) Formulas

- ΔTb = Tb - normal Tb
- ΔTb = i * kb * m
- m = moles of solute / kg of solvent

3) Solution:

3.1) m = n solute / kg solvent = 1.00 moles / 0.155 kg = 6.4516 m

3.2) i for NaCl is 2, because each molecule of NaCl dissolves into 2 ions.

3.3) ΔTb = 2 * 0.51 °C/m * 6.4516m = 6.58°C

3.3) ΔTb = Tb - normal Tb => Tb = ΔTb + normal Tb

normal Tb of water = 100°C

Tb = 6.58 °C + 100 °C = 106.58°C

Answer: 106.58°C

Answer:

100.67°C

Explanation:

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