Calculations using balanced chemical equations Revision

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Presentation transcript:

Calculations using balanced chemical equations Revision National 5 Chemistry Calculations using balanced chemical equations Revision

Calculate the mass of magnesium oxide formed when 6g of magnesium is burned in air. 2 Mg + O2 2 MgO Step 1: write down the balanced chemical equation if it is not given

Calculate the mass of magnesium oxide formed when 6g of magnesium is burned in air. 2 Mg + O2 2 MgO Step 2: select the substance being asked about and the substance you have been given information about

Calculate the mass of magnesium oxide formed when 6g of magnesium is burned in air. 2 Mg + O2 2 MgO 2 mol 1 mol 1 mol Step 3: write down the number of moles of each and simplify if possible

Calculate the mass of magnesium oxide formed when 6g of magnesium is burned in air. 2 Mg + O2 2 MgO 1 mol 1 mol 24.5 g (24.5 + 16) g 40.5 g Step 3: change moles to grams (data book page 7)

Calculate the mass of magnesium oxide formed when 6g of magnesium is burned in air. 2 Mg + O2 2 MgO 24.5 g 40.5 g 6 g y Step 4: put in what you are trying to find (call it x or y)

Calculate the mass of magnesium oxide formed when 6g of magnesium is burned in air. 2 Mg + O2 2 MgO 24.5 g 40.5 g 6 g y 24. 5 x y = 6 x 40.5 = 6 x 40.5 24.5 y = 9.9 g Step 5: cross multiply and solve to get the answer