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Calculate the relative molcular mass and vapour density of methyl alcohol [CH3OH] if 160 g. of the alcohol on vaporization has a volume of 112 litres at s.t.p. 

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Mass of 112 L of alcohol vapour at STP = 160g

∴ Mass of 1 L of alcohol vapour at STP has mass  = 160/112 g

= 1.4286 g

Mass of 1 L of H2 at STD = 0.09 g

∴ Vapour density

= Mass of given vol.of gas or vapour/mass of same vol.o H2 under similar T and P

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