If you were provided with the density of a gas and asked to find the molecular weight...?
Answer:
d = M p / RT
M is the molecular weight
M = d x RT / p
This is the formula.
Remember T must be in K
p in atm , d in g/L and R = 0.0821 L atm/ mol x K
molar mass = average molecular mass * (6.022*1023)
or
molar mass in g/mol= average molecular mass in u
Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
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