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हाइड्रोजन के दो समस्थानिकों की द्रव्यमान संख्याएँ क्रमशः 1 और 2 तथा परमाणु भार क्रमशः 1.0078 और 2.0143 हैं। साधारण हाइड्रोजन में ये समस्थानिक 6400:1 के अनुपात में उपस्थित हैं । हाइड्रोजन का औसत परमाणु भार क्या होगा ?

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हाइड्रोजन का परमाणु भार (औसत)`=((1.0078xx6400)+(2.0143xx1))/(6400+1)`
`= 1.008`

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