Question

20 mL of a gas containing H and S was heated with tin. When the reaction was over, there was no change in volume. The residual gas was hydrogen. If the
molecular weight of the gas is 34, calculate the molecular formula.​

Answer 1

Answer:

Eudiometry:-Eudiometry means gas analysis. It means in this type of numericals either you have to find out vol. of GAS From the data given in question or you have to find out any other thing like molecular formula of hydrocarbon ,no. of mole , mass of any other reactant and vol. of GAS is given. Specific gases are absorbed in specific reagents as given below

Reactants Absorbed gases

KOH solution CO2& SO2

Alkaline Pyrogallol O2

Solution of ammonical cuprous chloride CO

And if the mixture is cooled, H2O vapour changes to liquid.

Hence, when temperatureis above 1000C (373 K) then only volume of H2O is considered.

Eudiometry is mainly based on

Avogadro's law,

A(g)+ B(g)→ C(g) +D(g)

a volume b volume c volume d volume

a moles b moles c moles d moles

to find the molecular formula it simple means that volume of a gas is proportional to the mole taken.or vice-versa

(1)molecular formula of the gas is H2S,since SnS formed is deposited as a solid.

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