If 15 grams of sugar is dissolved in 250 mL of water, what is the molarity of th

Practice Questions

Q1
If 15 grams of sugar is dissolved in 250 mL of water, what is the molarity of the solution? (Molar mass of sugar = 180 g/mol)
  1. 0.33 M
  2. 0.5 M
  3. 0.25 M
  4. 0.75 M

Questions & Step-by-Step Solutions

If 15 grams of sugar is dissolved in 250 mL of water, what is the molarity of the solution? (Molar mass of sugar = 180 g/mol)
  • Step 1: Find the number of moles of sugar. Use the formula: Moles = Mass (g) / Molar mass (g/mol). Here, Mass = 15 grams and Molar mass = 180 g/mol.
  • Step 2: Calculate the moles of sugar: 15 g / 180 g/mol = 0.0833 moles.
  • Step 3: Convert the volume of water from mL to L. Since 1 L = 1000 mL, 250 mL = 0.25 L.
  • Step 4: Calculate the molarity of the solution using the formula: Molarity (M) = Moles of solute / Volume of solution (L).
  • Step 5: Substitute the values: Molarity = 0.0833 moles / 0.25 L.
  • Step 6: Calculate the molarity: 0.0833 moles / 0.25 L = 0.333 M.
  • Molarity – Molarity is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution.
  • Moles Calculation – Calculating moles involves dividing the mass of the solute by its molar mass.
  • Volume Conversion – Understanding that 250 mL is equivalent to 0.25 L is crucial for calculating molarity.
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