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At STP, the volume of 1 g of a gaseous s...

At STP, the volume of 1 g of a gaseous substance is 280 mL. find its relative molar mass.

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At STP, mass of 22400 mL of the gas`=(1)/(280)xx22400=80g`
now, on the basis of avogadro's hypothesis, 22400 mL (at STP) of any gas contains 1 gram-mole of the substance.
`therefore` Molar mass of the gas=80.
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