Determine the number of grams in a mole of...?

Determine the number of grams in a mole of each of the following gases.
(a) nitrogen

(b) ozone

(c) xenon

We have to determine the molar mass of the following gases

a ) nitrogen is N2 . Molar mass =14 + 14 = 28 g/mol so 1 mole weights 28 g

b) ozone is O3 . Molar mass = 16 + 16+ 16 = 48 g/mol so 1 mole weights 48 g

c ) Xe . Atomic mass = 131.3 g/mol so 1 mole weights 131.3 g
By definition, the molar mass is the mass of a mole of a given element / compound.

Therefore since:

where M = molar mass, m = mass, n = moles



Now, gaseous Nitrogen is a bimolecular gas, N2, Ozone is trimolecular O3 and Xenon is unimolecular Xe.

Do the math.
you need to remember that :
number of moles = mass / molar mass or:
n = m/Mw
Mw = N2= 14*2 = 28g/mole



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