Calculating Yield

• Answer the question below?

  Mass of magnesium sulfate = 240g

  
• • The image below tells us that starting with 48g of magnesium , we can make a  maximum of 240g of magnesium sulfate 
  • Scientists call this 100% yield , and for this to happen , every single atom of magnesium must react to form the product magnesium sulfate

  
• Calculate the percentage yield below

  Percentage yield 62.5%

  
• • We cannot achieve a yield greater than 100% 
  • That would mean we have created atoms 
  • This is not possible
• 50kg of calcium carbonate is expected to produce 28kg of calcium oxide. A company heats 50kg of calcium carbonate in a kiln and obtains 22kg of calcium oxide. Calculate the percentage yield?

  Percentage yield = 78.6%
• Calculate the percentage yield (Hint - find the moles of zinc , as this will be equal to the moles of copper. Then find the maximum theoretical mass of copper)?

  Percentage yield = 20%

  
• Calculate the percentage yield?

  Percentage yield = 60%