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Percentage purity of potassium chlorate when impure 4.9g of it heated to give oxygen whose mass is reduced by 0.32g?
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Percentage purity of potassium chlorate when impure 4.9g of it heated ...
Calculation of Percentage Purity of Potassium Chlorate


Given Data:


  • Mass of impure potassium chlorate = 4.9 g

  • Mass of oxygen produced = Mass of impure potassium chlorate - Mass of residue

  • Mass of residue = 0.32 g



Formula:


  • Percentage purity = (Pure substance/Impure substance) x 100

  • Moles of pure substance = Moles of impure substance x (Pure substance/Impure substance)

  • Moles of impure substance = Mass of impure substance/Molar mass of impure substance

  • Molar mass of potassium chlorate = 122.55 g/mol



Calculation:


  • Moles of impure potassium chlorate = 4.9 g/122.55 g/mol = 0.0399 mol

  • Mass of pure oxygen = Mass of impure potassium chlorate - Mass of residue = 4.9 g - 0.32 g = 4.58 g

  • Moles of pure oxygen = 4.58 g/32 g/mol = 0.143 mol

  • Moles of pure potassium chlorate = Moles of impure potassium chlorate x (Pure substance/Impure substance) = 0.0399 mol x (0.143 mol/0.0399 mol) = 0.143 mol

  • Mass of pure potassium chlorate = Moles of pure potassium chlorate x Molar mass of potassium chlorate = 0.143 mol x 122.55 g/mol = 17.6 g

  • Percentage purity of potassium chlorate = (Pure substance/Impure substance) x 100 = (17.6 g/4.9 g) x 100 = 359.18%



Answer:

The percentage purity of potassium chlorate is 359.18%.
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Percentage purity of potassium chlorate when impure 4.9g of it heated ...
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Percentage purity of potassium chlorate when impure 4.9g of it heated to give oxygen whose mass is reduced by 0.32g?
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