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किसी यौगिक की प्रतिशत रचना निम्नलिखित है :
`C=12.76`, `H=2.13` और `Br=85.11`
इसका वाष्प घनत्व `95` है। इसका अणुसूत्र बतलाइए।

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अतः , यौगिक का मूलानुपाती सूत्र `=CH_(2)Br` है।
यौगिक का मूलानुपाती सूत्रभार `=12+2+80=94`.
यौगिक का वाष्प घनत्व `=95`
`:.` यौगिक का अणुभार `=2xx95=190`
`:.n=(190)/(94)=2` (लगभग)
अतः, यौगिक का अणुसूत्र `(CH_(2)Br)_(2)=C_(2)H_(4)Br_(2)` है।

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