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check it in the list it is before this question written by me

ya but please try my previous question

not the one u dint get

but the one after that

Determine the percentage composition of a gas mixture CH₄, H₂ and CO₂, if after the combustion of 15mL of it with 85mL of air, the volume reduced to 83.2 mL and the total contents of CO₂ in the mixture was found to be 10.8mL.

Ans: H₂=28%, CH₄=35%, CO₂=37%

Three volatile compounds of certain elements have gaseous densities calculated back to STP as follows: 6.75, 9.56 and 10.08 kg/m³. The three compounds contain 96%, 33.9% and 96.4% of the element in question respectively. What is the most probable atomic weight of the element?

(Ans: 72.5/n, where n is an integer)

I m gettin the answer as 72.5n is it correct?

read the question carefully I2 is in solid state and it is occupiying some specific volume in the 1 litre vessel. Thats why u cant take the volume in the first vessel as 1 litre u have to take it as some (1-x) litre where x is the volume of i2 present in the first vessel. and u cant use PV=nRT for solids.

I think the answer is wrong because u cant use PV=nRT for solids and I2 is in solid state.Some amount of volume is occupied by it also. So N2 cant use whole of the 1 litre. Correct ans is 0.425atm. But i dont know how 2 get it.

A vessel contains 10g of I₂(s) and N₂ at a pressure of 10atm at 25^oC. The volume of the vessel is one litre. If this vessel is connected to a 40 litre empty vessel and the temperature of the first vessel is increased to 250^oC and of the second to 200^oC. Calculate the final pressure in the vessels.