Question

3.7 gram of a metal oxide was heated with charcoal . The liberated CO2 was adsorbed in NaOH solution and weighed 1 gram . If the specific gravity of the metal is .095cal/g the exact atomic mass of the metal is

Answer 1

Vapour density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen.

vapour density = mass of n molecules of gas / mass of n molecules of hydrogen.

Thus:

vapour density = molar mass of gas / molar mass of H2

vapour density = molar mass of gas / 2.016

vapour density = ~½ × molar mass

(and thus: molar mass = ~2 × vapour density) For example, vapour density of mixture of NO2and N2O4 is 38. 3.Vapour density is a unitless quantity.



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Answer 2

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