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.
Fluorine (F) is a halogen gas element with a mass of approximately 19. It is the lightest halogen gas, as elements of the halogen group have masses ranging from 19 to 35.
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. It has an atomic number of 36, which means it has 36 protons in its nucleus. The total mass of Krypton is slightly less than 100 atomic mass units.
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.
A block of wood is heavier than gas because the wood has more mass and density compared to the gas molecules which are spread out in the container. The atoms and molecules in the gas have less mass and are flying around with more space between them, making the gas less dense and lighter than a solid block of wood.
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.
Chlorine gas is more reactive than hydrogen gas. Chlorine is a halogen and has a stronger tendency to gain electrons during a reaction, making it more reactive. Hydrogen, on the other hand, is more stable and less likely to undergo chemical reactions.
If gas bubbles escape the volumetric flask, the calculated molar mass of the gas will be less than the theoretical molecular value. This is because the number of moles of gas remaining in the flask will be underestimated, leading to a lower molar mass calculation.