Calculate Molarity of 0.342M Sugar Solution

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SUMMARY

The discussion focuses on calculating the molality of a 0.342M sugar (C12H22O11) solution with a density of 1.12g/mL. The correct approach involves converting the molarity to grams of sugar per liter using the formula weight of sugar. The final calculated molality is 0.341m, which requires understanding the relationship between density and mass of the solution. Participants emphasize the importance of distinguishing between molarity and molality in such calculations.

PREREQUISITES
  • Understanding of molarity and molality concepts
  • Knowledge of calculating formula weight from empirical formulas
  • Familiarity with density and its application in solution calculations
  • Basic skills in unit conversion and dimensional analysis
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  • Learn how to calculate formula weight for organic compounds
  • Study the differences between molarity and molality in detail
  • Explore density calculations for various solutions
  • Practice problems involving molality calculations for different solutes
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Chemistry students, educators, and professionals involved in solution preparation and analysis will benefit from this discussion, particularly those focusing on solution concentration calculations.

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Here is the problem..

Calculate the molarity of a 0.342M sugar (C12H22O11) solution that has a density of 1.12g/mL.

The answer is 0.341m but I don't know the steps..

Please help me with this problem :(
 
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You probably asked for "Molarity" when you meant to ask for "Molality".
Starting with your 0.342 moles per liter of sugar solution, use the formula weight to find GRAMS of sugar per liter of solution. You need to calculate the formula weight of the compound from the empirical formula. Can you do the rest?
 
fidypomi said:
Here is the problem..

Calculate the molarity of a 0.342M sugar (C12H22O11) solution that has a density of 1.12g/mL.

The answer is 0.341m but I don't know the steps..

Please help me with this problem :(

The bolded thing is the abbreviation for molarity. I assume that the question actually asked you to solve for the molality (moles per Kg of solution).

Can you see that the density of the solution will be helpful? If each mL of solution weighs 1.12 g, how much will 1000 mL weigh? And how much sugar will be in that 1000 mL (or liter)?
 

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