Question

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


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Answer 1

Explanation:

12 g of magnesium powder was ignited in a container having 20 g of pure oxygen. Hence, this all reaction is based on law of constant proportions. 12g + 20g⎯→12g + 20g As in this case 12 gram of oxygen is unreacted and rest of 20 gram of MgO is going to be formed.

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Answer 2

Answer:

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