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How to find a Molucular formula of a gas using Euidometry? 1) 20ml of gas containing H and S was heated with tin. When reaction was over, no change in volume was observed. Hydrogen was the residual gas. If molecular weight of the gas is 34gm. Find its molecular formula?

How to find a Molucular formula of a gas using Euidometry?
1) 20ml of gas containing H and S was heated with tin. When reaction was over, no change in volume was observed. Hydrogen was the residual gas. If molecular weight of the gas is 34gm. Find its molecular formula?
 

Grade:11

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago

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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