Question 38 of 50beginner🔧 ApplyNumerical2 marks

Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN.

Correct Answer

The mass percentage of aspirin (C₉H₈O₄) in acetonitrile (CH₃CN) is 1.42%.

Exercise: EXERCISES | Q: 1.28 | (Page 29)
For More Understanding

Explanation

This question tests the understanding of mass percentage concentration. The formula for mass percentage is provided in the textbook context. Students need to identify the solute (aspirin) and solvent (acetonitrile), calculate the total mass of solution, and then apply the formula correctly.

Solution Steps

  1. Step 1: Identify the given values. Mass of aspirin (solute) = 6.5 g Mass of acetonitrile (solvent) = 450 g

  2. Step 2: Calculate the total mass of the solution. Total mass of solution = Mass of solute + Mass of solvent Total mass of solution = 6.5 g + 450 g = 456.5 g

  3. Step 3: Apply the mass percentage formula. Mass % of aspirin = (Mass of aspirin / Total mass of solution) × 100 Mass % of aspirin = (6.5 g / 456.5 g) × 100 Mass % of aspirin = 1.42%

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