calculation masses in reactions

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Last updated 3:59 PM on 4/27/26
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4 Terms

1
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how to calculate the amount of product from a mass of reactant

work out balanced equation

work out relative formula mass

find out the number of moles in the substance

use the number of moles to calcite the mass

2
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what mass of magnesium oxide is produced when 60g of magnesium is burnt in the air

write out the balanced equation

  • 2Mg + 02 —> 2MgO

work out relative formula mass

  • Mg = 24

  • O = 16

Calculate the number of moles of magnesium in 60g

  • 60 / 24 =2.5

look at the ratio of moles in the equation

  • 2 moles in the equation of magnesium will produce 2 moles of magnesium oxide

calculate the mass of 2.5 moles of magnesium oxide

  • 2.5 × 40 =100

3
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what is the formula of percentage yield

percentage yield - actual yield / theoretical yield x 100

4
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done

done