An aqueous solution is 3.00% by mass dextrose (c6h12o6) in water. if the density of the solution is 1.0097 g/ml, calculate the molarity of dextrose in the solution.
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Ответ:
[C₆H₁₂O₆] = 0.17M
Explanation:
3% by mass, means 3 g of solute in 100 g of solution.
Density is mass / volume. This data always refers to solution.
Solution density = Solution mass / Solution volume
1.0097 g/mL = 100 g / Solution volume
Solution volume = 100 g / 1.0097 g/mL → 99.03 mL
Let's convert the mL to L, for molarity (mol/L)
99.03 mL = 0.09903 L
Now we have to find out the moles. Let's calculate them with the molar mass
(mass / molar mass)
3 g / 180 g/mol = 0.0166 mol
Molarity is mol/L → 0.0166 mol/0.09903 L → 0.17 M
Ответ:
Which is the independent variable in this experiment?
✔ type of material
Which is the dependent variable in this experiment?
✔ temperature of material
Which is a controlled variable in this experiment?
✔ amount of heat materials received