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carbon dioxide
At $3 per gallon you can buy slightly less than 6 gallons with $17.85.
gas chromatography mass selective detector
That all depends on the type of gas and volume given for the problem. We can't determine the mass and density of the gas cylinder if we are not given these info, which can also include pressure (because density varies based on that variable).
A cubic metre of gas at normal temperature and pressure has a mass of 44.643 times the molecular weight of the gas in grams. So a cubic metre of hydrogen is 89.3 grams while a cubic metre of CO2 is 1964 grams. If the volume is 22.4 litres, the mass in grams equals the molecular weight.
Fluorine, at 19 atomic mass units, is the only halogen gas that fits that requirement.
No halogen gas has a mass of under 15 atomic mass units. The closest is fluorine, at 19.0 atomic mass units.
The element with a mass number of 19 could be fluorine, which is a halogen and a gas, but not a noble gas.
The noble gas with 48 neutrons and a mass of less than 100 is krypton-84.
Helium
Halogen gas is in a Tungsten-Halogen Light Bulb.
Halogen.
Halogen is a gas, so your question doesn't make much sense. If you're asking about a halogen (light) bulb, then the answer is: mainly halogen.
Saturn is a planet made out of mostly gas. As gas has little mass, it is less dense than Earth. Remember that density is proportional to its mass and surface area.
Argon is a noble gas. It is not a halogen. Fluorine is a example for that.
helium (He)
No. The ashes have less mass. Mass is "lost" through carbon particles that bind with oxygen to form carbon dioxide gas.