1) Write out the balanced equation
2) Work out Mr - just for the bits you need
3) Divide to get ONE, then mutiply to get ALL
What mass of magnesium oxide is produced when 60g of magnesium is burned in air?
1) 2Mg + O2 -----> 2MgO
2) 2 x 24 ------> 2 x (24 +16) (ignore oxygen)
48 ----> 80
3) 48 of Mg reacts to give 80g of MgO
1g of Mg reacts to give 1.67g of MgO
60g of Mg reacts to give 100g of MgO
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