Class 9 Exam > Class 9 Questions > 18 g of water is electrolysed. The weight of ...
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18 g of water is electrolysed. The weight of oxygen formed will be
- a)16 g
- b)8 g
- c)4 g
- d)2 g
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
18 g of water is electrolysed. The weight of oxygen formed will bea)16...
Electrolysis of Water
Electrolysis is a process of decomposition of a compound by passing electricity through it. Water can also be electrolyzed to produce hydrogen and oxygen gases.
The balanced chemical equation for the electrolysis of water is as follows:
2H2O(l) → 2H2(g) + O2(g)
From this equation, it is clear that for every 2 moles of water electrolyzed, 1 mole of oxygen gas is produced.
Calculation of Oxygen Gas Produced
Given that 18 g of water is electrolyzed, we need to calculate the weight of oxygen gas produced.
The molar mass of water (H2O) is 18 g/mol. Therefore, 18 g of water is equal to 1 mole of water.
According to the balanced chemical equation, 1 mole of water produces 1/2 mole of oxygen gas.
The molar mass of oxygen (O2) is 32 g/mol. Therefore, 1/2 mole of oxygen gas is equal to 16 g.
Hence, the weight of oxygen gas produced from the electrolysis of 18 g of water is 16 g.
Therefore, option A, 16 g, is the correct answer.
Electrolysis is a process of decomposition of a compound by passing electricity through it. Water can also be electrolyzed to produce hydrogen and oxygen gases.
The balanced chemical equation for the electrolysis of water is as follows:
2H2O(l) → 2H2(g) + O2(g)
From this equation, it is clear that for every 2 moles of water electrolyzed, 1 mole of oxygen gas is produced.
Calculation of Oxygen Gas Produced
Given that 18 g of water is electrolyzed, we need to calculate the weight of oxygen gas produced.
The molar mass of water (H2O) is 18 g/mol. Therefore, 18 g of water is equal to 1 mole of water.
According to the balanced chemical equation, 1 mole of water produces 1/2 mole of oxygen gas.
The molar mass of oxygen (O2) is 32 g/mol. Therefore, 1/2 mole of oxygen gas is equal to 16 g.
Hence, the weight of oxygen gas produced from the electrolysis of 18 g of water is 16 g.
Therefore, option A, 16 g, is the correct answer.
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18 g of water is electrolysed. The weight of oxygen formed will bea)16...
Yeah this happened according to the law of constant proportion which ensures that the elements will combine in fixed ratio by mass. Also source may be different but rhe product will always give the same amount of hydrogengen and oxygen i. e. 2:16 or 1:8 .
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