Question

If 9 gram of water is decomposed how many grams of oxygen and hydrogen are obtained

Answer 1

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Since, hydrogen and oxygen combine in the ratio 1:8 to form water 
Therefore 1x+8x=9g 
9x=9
X=9/9 
Therefore mass of hydrogen =1x=1×9/9=9/9g or 1g 
Mass of oxygen =8x =8×9/9=8×1=8g
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Answer 2

Hello there !

Ur answer is in the attachment