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A Dumas bulb of capacity 200 mL weighs 2...

A Dumas bulb of capacity 200 mL weighs 22.567 g at `120^(@)С.` Filled with vapour of a substance at 120°C and 755 mmHg pressure, it weighs 22.8617 g. Find the molecular weight of the substance.

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`47.8`
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