1.4.3 - Calculations Involving Percent Composition and ppm/ppb
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Practice Questions
Test your understanding with targeted questions
Calculate the percent composition of oxygen in H₂O, given that the molar mass of water is 18.02 g/mol.
💡 Hint: Use the formula for percent composition.
What does 2.0 ppm mean in terms of mass?
💡 Hint: Remember the definition of ppm.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What formula is used to calculate percent by mass?
💡 Hint: Think about how to express a fraction as a percentage.
1 ppm is equivalent to ____ mg of solute in 1 kg of solution.
💡 Hint: Recall the definition of ppm.
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Challenge Problems
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A solution contains 4.5 g of sodium chloride in 600 g of solution. Calculate the percent by mass of sodium chloride, and then determine its ppm in the same solution.
💡 Hint: Use the definitions for both percent mass and ppm to guide your calculations.
A water sample has 0.012 g of a contaminant in 2 kg of water. Calculate the concentration in both ppm and ppb.
💡 Hint: Convert all masses to the appropriate units before applying the formulas.
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