12 g of magnesium powder was ignited in a container having 20 g of pure oxygen. After the reaction was over, it was found that 12 g of oxygen was left unreacted. Show that it is according to law of constant proportions.

12 g of magnesium powder was ignited in a container having 20 g of pure oxygen. After the reaction was over, it was found that 12 g of oxygen was left unreacted. Show that it is according to law of constant proportions.

2Mg + O2 ⎯→ 2MgO

Ans: – As from the explanation it is clear that the oxygen which is reacted is (20-12=8) 8gm. So we can see that 12gm of Mg is reacting with 8gm of O2 and in MgO also the 24 gm magnesium is reacting with 16 gm of oxygen or in the same ratio.

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