Question

the molality of glucose when 0.015 moles of glucose dissolve in 30g of water .
a) 0.50m
b) 5.4m
c) 1m
d) 0.3m
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Answer 1

the molality of Gul coach when 0.015 moles of glucose is dissolved in 30 gram of water 0.50

Answer 2

Molality of glucose =  0.5 mol/kg

Explanation:

Given: 0.015 moles of glucose dissolved in 30g of water.

Find: Molality of glucose

Solution:

Molar mass of water (H2O) = 2 + 16 = 18 g

Moles of water = 30/18 = 1.66  

Molar mass of glucose (C₆H₁₂O₆) = 6*12 + 12 + 6*16 = 180 g

Moles of glucose = 0.015  (given)

Molality = moles of solute * 1000 / Mass of solvent

Molality = 0.015 * 1000 / 30

Molality = 0.5 mol/kg

Option A is the answer.