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mole is short for molecular. they are basically one in the same. the molecular mass is in amus, the average mass unit, and the mole is a number that converts amus to grams. a mole is the amount of particle in 12 grams of carbon-12, best explained by avagadros number: 6.022*10^23. this is to say molecular mass is the mass of a molecule, and the molar mass is the amount of moles. so there would be 10 moles in 10 grams of Hydrogen. and a molecule of hydrogen, H2, would be 2.014 amu.

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14y ago
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11y ago

vapour density is defined as the ratio of mass of gas occupying a certain volume at a certain P and T to the mass of hydrogen in the same condition.

PV=nRT=(g/M0)*RT

=>gx=PVM0/RT

and gH2=PV*2/RT (M0=2 for hydrogen)

=>gx/gH2=Mx/2 alternate solution:

Links:http://books.Google.co.in/books?id=iywzs1GYt-AC&pg=PA18&lpg=PA18&dq=relationship+between+molecular+weight+and+vapour+density&source=bl&ots=gzj13UeUjL&sig=X-UMIaiehoLOlLYyxDN0qxLi9zw&hl=en&sa=X&ei=A0r0T4C7L8HprAeAvKzZBg&ved=0CFcQ6AEwBQ#v=onepage&q=relationship%20between%20molecular%20weight%20and%20vapour%20density&f=false

http://chem-guide.blogspot.in/2010/03/deduction-of-relationship-between_31.html

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12y ago

The formula is:

M = dRT/P where:

- d is the density in g/L

- R is the gas constant; R = 8,314 462 1 J/mol.K

- T is the temperature in kelvins

- P is the pressure in torr

- M is the molar mass in grams

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14y ago

Object that are large move slowly, so as molar mass increases, velocity decreases.

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