Question

In a Victor Meyer's determination ,0.36g of volatile substance displaces air which measures 140 ml at STP. Calculate the vapour density and molecular weight of the substance(1 litre of H2 at stp STP weight 0.09g)

Answer 1

The mass of the substance is  57.63 g and the Vapour density is 28.81 g/m^3.

Explanation:

Volume occupies by solute at NTP  = Volume of air displaced at NTP = 140 ml

Since for volatile solute we have

PV = ω / m RT

We know that

P = 1 atm , T = 273 k at NTP.

Now

140 / 1000 =  0.36 / m x 0.0821 x 273

14 m / 100 = 8.069

14 m = 806.9

m = 806.9 / 14 = 57.63 g

Vapour density = mass / volume

Vapour density =  57.63 / 2 = 28.81 g / m^3

Hence the mass of the substance is  57.63 g and the Vapour density is 28.81 g/m^3

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