Just list some. I need some for a science project that I am going to do. Thanks
2007-03-16 16:04:38 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Physics
You can figure this one out very easily with the periodic table and the formula. Our air is a mixture of oxygen gas (O2) and nitrogen gas (N2). Oxygen atom's mass is 16, so O2 is 32. N is 14, so N2 is 28. Being about 80% nitrogen, air comes in at about 28.8.
So, pick any gas and add up the masses: CO2=12+16+16=44. That's more than 28.8, so the gas is "heavier" (you really mean "more dense") than air.
Hydrogen sulphide (rotten egg smell): H2S=34.
But helium: H=4 and hydrogen H2=2 are less than 28.8, so less dense than air.
That's all there is to it!
2007-03-16 16:14:58 · answer #1 · answered by Rob S 3 · 0⤊ 0⤋
The easiest way to see this would be to look on the perodic table of elements and just look on there to see which gases are heavier. You Should have one in your science book.
2007-03-16 23:07:30 · answer #2 · answered by Anonymous · 0⤊ 0⤋
"Our air" has a nominal molecular weight of 29. Gases heavier than that are Argon (MW=40), CO2 (MW=44), SO2 (MW=64), UF6 (MW=257) and many others.
2007-03-16 23:09:27 · answer #3 · answered by cattbarf 7 · 0⤊ 0⤋
Carbon dioxide, ammonia, etc. Basically any gas that has a higher atomic weight than O2 and N2.
2007-03-16 23:08:42 · answer #4 · answered by mr.quark 2 · 1⤊ 0⤋
Anything heavier than Nitrogen
And if a fart were heavier, it would sink not rise.
2007-03-16 23:13:52 · answer #5 · answered by Anonymous · 0⤊ 0⤋
All except hydrogen, helium, methane, ammonia and nitrogen. If you need a heavy gas, try butane
2007-03-16 23:34:17 · answer #6 · answered by Lyle G 3 · 0⤊ 0⤋
Fart.
2007-03-16 23:07:30 · answer #7 · answered by *Beautiful Zephyr* 3 · 0⤊ 1⤋