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मानक ताप और दाब पर 20 g हाइड्रोजन गैस का लीटर में आयतन निकालें ।

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हाइड्रोजन के मोलों `= ("हाइड्रोजन का द्रव्यमान")/("हाइड्रोजन का ग्राम-आणविक द्रव्यमान")`
`= (20 g)/(2g) = 10`
अब, 1 `because` 1 मोल हाइड्रोजन का आयतन मानक तप व दाब पर 22.4 L
`:.` 10 मोल हाइड्रोजन का आयतन `= 10 xx 22.4 L`
= 224 L.

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