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जल `(H_(2)O)` में हाइड्रोजन और ऑक्सीजन की प्रतिशत मात्रा ज्ञात करें। (H = 1, O = 16)

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जल का आणविक द्रव्यमान `= 2 xx 1 + 16 = 18`.
अतः , 18 g जल में 2g हाइड्रोजन है।
`:.` हाइड्रोजन का प्रतिशत मात्रा `= (2)/(18) xx 100 = 11.1%`
इसी प्रकार, ऑक्सीजन की प्रतिशत मात्रा
`= (16)/(18) xx 100 = 88.9%`.

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