Question

9 gram Jal Mein oxygen ki Kitni Matra hoti hai ​

Answer 1

Explanation:

hydrogen:oxygen=2:1

let us take hydrogen and oxygen as 2x, 1x

and oxygen mass be y grams

total=3

1x/3x = y/9

y=9/3

y=3

please follow

Answer 2

In 9 grams of water there are 8 grams of oxygen .

Explanation:

Mass of water = 9 g

Moles of water = $\frac{9 g}{18 g/mol}=0.5 moles$

in 1 mole of water there are 1 mole of oxygen atom.

Then in 0.5 moles of water will have ;

$0.5\times 1=0.5 mol$ of water

Mass of 0.5 moles of oxygen atom:

0.5 mol × 16 g/mol = 8 g

In 9 grams of water there are 8 grams of oxygen .

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