Quickly ! what is the density of each of the following gases at stp? show your work.
a. c3h9
b. ne
c. no2

Explanation:

So if we have the molar mass of the gas , just divide it by 22.4 to get the density of that gas.

One mole of a gas at STP has a volume of. 224 L

C3H9

Molecular mass of C3H9 =45.1036 g/mol

Density =mass/volume  

=(45.1036 g/mol)/( 22.4 L/mol)

=2.013 g/l

Ne

Molecular mass of Ne (neon) =0.00060 g/mol

=(0.00060 g/mol)/ (22.4 L/mol)

=0.000026 g/l

Molecular mass of NO2 (nitrogen dioxide)=0.00080 g/mol  

=(0.00080 g/mol )/ (22.4 L/mol)

=0.000035 g/l

the answer is barium and copper bromide

there are two significant figures.