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To find the no. of moles use the formula: n=m/MM or moles= mass divided by Molecular mass
At STP conditions , we have many relations ,
If Volume is known at stp for gas. Mole = Volume / 22.4 liters If no. of molecules/ions/atoms... are known Mole = no. of substance / (6.023 * 10^23) If mass , and formula mass are known Mole = Mass / Formula Mass If vapour density and mass are known Mole = Mass / (Vapour Density * 2) etc.
If u r question is to calculate no. of moles if vapour density is given, then
molecular formula : A chemical formula that shows the number and kinds of atoms in a molecule.
MM = dRT/P I would like to explain through an example: Q) A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100°C and 760 mm Hg. If the empirical formula of this compound is CH, what is the molecular formula of this compound?
Ans) use the formula: MM = dRT/P 100°C = 373K 760 torr = 1atm MM = (2.550g/L)(0.08206/mol*K)(373K)/(1atm) MM = 78.05g/mol MM CH = 13 g/mol 78.05g/mol / 13g/mol = 6 compund is :C6H6
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Regards, Naga Ramesh IIT Kgp - 2005 batch
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