Question

If 9g of water is decomposed ,1g of hydrogen is obtained.What is amount of oxygen obtained​

Answer 1

Your answer:

Decomposition of water = 2H₂O = 2H₂ + O₂

36g of water gives 4 gram of hydrogen and 32 gram of oxygen

Here, you see that the mass of the reactant = mass of products obtained

So, 9 gram of water will give: 9-1 = 8g of oxygen

Or, you can also do like this:

two moles of water gives two moles of hydrogen and one mole of oxygen

No. of moles of water in 9g = 9/18 = 0.5

0.5 moles of water gives 0.5 moles of hydrogen and 0.5/2 = 0.25 moles of oxygen

Mass of 0.25 moles of oxygen = 0.25 x 32 = 8g

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