Question #01990

1 Answer
MeneerNask
Feb 25, 2016

You may compare molecular masses, as all gasses have the same number of molecules in a certain volume. At STP 0 deg C and 1 Bar one mole of gas has a volume of 22.4 L.

Explanation:

Molar masses in #g//mol#:
#Ne=20.18#
#N_2=2xx14.01=28.02#
#NH_3=14.01+3xx1.008=17.03#
#CO=12.01+16.00=28.01#

Ranking the densities from low to high:
#NH_3-Ne-CO-N_2#

You could calculate the densities by dividing molar mass by molar volume, though this is not necessary to solve the problem.
E.g. #NH_3: rho=17.03/22.4=0.760g//L=0.760kg//m^3#

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