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vovangra [49]
2 years ago
6

What is the molality of a D-glucose solution prepared by dissolving 36.0 g of D-glucose, C6H12O6, in 125.9 g of water

Chemistry
1 answer:
mestny [16]2 years ago
6 0

Answer:

1.59 molal

Explanation:

The <u>definition of molality</u> is:

  • molality = moles solute / kg of solvent

So first <u>we calculate the moles of solute</u> (D-glucose, C₆H₁₂O₆), using its <em>molar mass</em>:

  • 36.0 g C₆H₁₂O₆ ÷ 180.156 g/mol = 0.200 mol C₆H₁₂O₆

Then we<u> convert grams of water into kg</u>:

  • 125.9 g H₂O * \frac{1kg}{1000g} = 0.1259 kg H₂O

Finally we <u>calculate the molality</u>:

  • m =  0.200 mol / 0.1259 kg
  • m = 1.59 m
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