1
Question
Magnesium and oxygen combine in the ratio of 3 : 2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 g of magnesium ?
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Solution
Magnesium + oxygen ------------> Magnesium oxide
2Mg + O2 -----------------------> 2MgO
We have been given that Mg reacts with Oxygen in the fixed ratio of 3 : 2by mass.
3g of Mg requires = 2g of oxygen
So, 24g of Mg requires = 
= 16g
So, 24g of Mg requires, 16g of oxygen to combine.
Magnesium + oxygen ------------> Magnesium oxide
2Mg + O2 -----------------------> 2MgO
We have been given that Mg reacts with Oxygen in the fixed ratio of 3 : 2by mass.
3g of Mg requires = 2g of oxygen
So, 24g of Mg requires =
= 16g
So, 24g of Mg requires, 16g of oxygen to combine.
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