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0.3151 g of a substance when interduced ...

`0.3151` g of a substance when interduced into a Hofmann's tube generated `128.5 mL ` of vapour at `30^(@)C,` the level of Hg inside being 430 mm higher than outside the tube, and the barometer reading was 758 mm. Calculate the molecular weight of the substance.

Text Solution

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Pressure of vapour in Hofmann.s tube `=(758-430) mm = 328 mm.`
Volume of vapour at `NTP = (328 xx 128.5 xx 273)/(303 xx 760)= 50 mL.`
Mole of vapour `= (50)/(22400).`
Molecular weight `= 0.3151xx (22400)/(50) = 151.16.`
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