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How does one go about finding the Molecular Mass of gases?

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Molecular Mass of Gases
Well the gases at room temp are almost all made from elements in the top right corner of the periodic table of elements
ie from these elements and their mole wts
H-1 He-4 C-12 N-14 O-16 F-19 Ne-20.2
P-31 S-32 Cl-35.5 Ar-39.9 Br-79.9
(1) For He Ne Ar the mol wt is the wt I've shown, single atoms = molecules
(2) The rest all use two atoms to H2=2g N2=28 P2=62 Br2=159.8g etc
(3) For mixed molecules eg C02 = 12 + (16x2) =44g. H2S = 1x2+32=34g

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Thank you. ^_^
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mm=DRT/P or density x gas constant (.08206) x temp(in K) divided by pressure (atm). Just remember it as "molar mass of a gas = dirty pee" ha it's kind of gross but it's pretty easy to remember. **By the way, I noticed that you asked another question relating to this that I can answer if you want but it's kind of old so I don't wanna answer if you already figured it out :P