Question

# 34 g of H2O decomposes to _______ g of hydrogen and ____ g of oxygen.

A

30 gm of oxygen and 4 gm of hydrogen

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B

16 gm of oxygen and 18 gm of hydrogen

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C

32 gm of oxygen and 2 grams of hydrogen

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D

3.78 gm H2 and 30.22 gm O2.

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Solution

## The correct option is D 3.78 gm H2 and 30.22 gm O2. 2H2O → 2H2 + O2 2 moles 2 moles 1 mole 36 g 4 g 32 g 2 mole of water weighs 36 g. 2 mole of H2 weighs 4 g 1 mole of O2 weighs 32 g 36 g H2O gives 4g H2 and 32 g O2. So, 34 g H2O gives 4×3436 g H2 and 32×3436 O2. So, 34 g H2O gives 3.78 g H2 and 30.22 g O2.

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