Relative Molecular Mass
Relative molecular mass is the ratio of the mass of one molecule of a substance to the mass 
Vapour Density
Vapour density is the ratio of the mass of a volume of a gas, to the mass of an equal volume of hydrogen, measured under the same conditions of temperature and pressure.
According to Avogadro's law, equal volumes of all gases contain equal number of molecules.
Thus, let the number of molecules in one volume = n,
We can therefore substitute the above equation, and arrive at the below formula
Now on cross multiplication, we have
2 x vapour density = Relative Molecular Mass of a gas
Relative Molecular Mass = 2 x Vapour density
25 comments:
Thank You so much Sir.This was very helpful to me in my Mole Concept chapter.
Sir please help
2.32g of a hydrocarbon on ignition gave 7.3g of carbon(iv)oxide and 2.98g of water. If the vapour density of the hydrocarbon is 28. Calculate
I. The empirical formular
2. Molecular formular
3. Structural formular
4 draw the structures of the possible isomers and give the IUPAC name
Thank you
Thank u
C4H4
Butene
Butene
C4H4
If an equimolar mixture of NO and O2 are placed, then what is the vapour pressure of the mixture
Nice and it is too easy method of deduction of the relation of vappour density and molecular....
Nice and it is too easy method of deduction of the relation of vappour density and molecular....
You are right. That helped me too in my mole concept chapter.
Butene is C4H8
I must say, it is a highly relevant and useful article. Thank you sir!
Butene c4h8 molecular formula
Ch3chchch3,ch2chch2ch3,cyclobutane,methylcyclopropane
Butene c4h8 molecular formula
Ch3chchch3,ch2chch2ch3,cyclobutane,methylcyclopropane
Nnah ehh theses things are confusing me please where do a learner start from
Please where do a learner like starts from? Am so confused please all should help
Useful , Thanks
Something strange is happening here:
Vapour density is measured in kg/m3
Relative molecular mass is dimensionless.
So wouldn't it be strange that Relative molecular mass = 2* Vapour density ??
U r wrong vapour density doesnot hav unit it is ratio of mass upon mass ...so what u were thinking....plz be carefull
40 ml of mixture of Co and H2 yielded 15 ml of Co2 after explosion with excess O2 The ℅of H2 in the mixture
Me too, found it quite vexing before accessing this webpage.
According to Avogadro's hypothesis at same temp.and pressure equal volume of any gas contains equal number of molecule.
(D)=n-molecules of gas/n-molecules of hydrogen
=Weight of 1-molexule of gas/weight of 1-molecule of hydrogen
=Molecular weight of gas (M)/molecular weight of hydrogen.
Really it was helping and helped me a lot in solving problems related to gases
Vapour density too means relative density
A mixture of methane and oxygen has vapour density 10. The % (by mole) of methane is ?? Pls help with this question sir
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