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It depends what other conditions you are giving us. Most elements and compounds exist at all three states (solid, liquid, and gas) at various temperatures and pressures. Even lead can exist at a vapor, albeit at a very high temperature. However you probably are more interested in the gas with the highest density at a temperature and pressure that we can all relate to, Standard Ambient Temperature and Pressure (SATP), which is essentially room temperature (25 deg C) and at a pressure equal to that at ground level (1 ATM).
If you want to know the gas with the greatest density regardless of SATP, the densest gas is Ununoctium or element 118. It exist as a gas near SATP, at around 50-110 deg C. Ununoctium is currently the only synthetic member of group 18 and has the highest atomic number and highest Atomic Mass assigned to a discovered element. The radioactive ununoctium atom is very unstable, and since 2002, only three atoms of the isotope 294Uuo have been detected. Although ununoctium is a member of the noble gas group, it could have a higher chemical reactivity than some elements outside this group. It was formerly thought to be a gas but is now predicted to be a semimetallic solid under normal conditions.
If you want to know the gas with the greatest density at that at SATP, the densest gas is tungsten hexafluoride. This corrosive, colourless compound is the densest known gas at a pressure of 1 ATM and room temperature (25 deg C). The colorless gas is most commonly used in the production of semiconductor circuits and circuit boards through the process of chemical vapor deposition. It has a density of 13.1 grams per liter of gas.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoits helium
with a density of 4.003g/cm3
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Uranium Hexaflouride
Molar weight -- Uranium 238.03 g/mol + 6x(Florine 37.99 g/mol) = 465.97 g/mol
At room pressure, it sublimes at 56.5 °C.
PV=nRT
1V=1(0.082057)(273.15+56.5)'K
V=27 liters/mol
465.97 g/mol / 27L/mol = 17.26 g/L
Helium is only 0.1786 g/L
Radon is only 9.73g/L
Wiki User
∙ 13y agoHelium has the smallest molar mass of all the noble gasses and therefore the smallest density
Wiki User
∙ 8y agoCompared to liquids and solids, gases have the smallest densities. This is because their particles are widely spaced out.
Wiki User
∙ 12y agoHydrogen gas.
Wiki User
∙ 11y agohelium
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Will ammonia gas float a balloon?
No, the density is too high.
Why diffusion is maximum in gases?
rate of diffusion is inversely proposnal to density, density of gas is less. so diffusion rate is high
Do gas have quite high density?
Gas like every other thing in the universe, has density. Solid is very dense, liquid is dense but not as dense as a solid. Therefore, if everything in the universe has a density rate, a gas does have density, however, just a very low density.
Which states of matter has low density high density and quite high density?
You are asking for comparatives. Each state can be any when compared to another state except the extremes. Liquid or gas either lower or higher depending on what you compare it to.
Does mercury have any density?
Very high density
High density is a characteristic of which state of matter?
High density is a characteristic of a Gas. When something has a high density it means there is a lot of a certain gas, in one area.
Does gas has a high density?
no
What is the meaning Heavier gas?
This is a gas with high density.
Which of the gas has high density?
That one.
Will ammonia gas float a balloon?
No, the density is too high.
Why is plutonium heavier than hydrogen?
Plutonium is a high-density metal, hydrogen a low-density gas.
Two characteristics of a gas are?
Low density, no shape, high compressibility
Does high pressure have high density?
If you are referring to a high pressure gas, then yes. The higher the pressure, the higher the density of the gas because the molecules pack closer together. The density of liquids can also be affected by pressure but to much less of an extent. For most purposes, liquids such as water are considered incompressible.
Does gas have a high density?
Hydrogen gas has 0.000089 ml Helium gas has 0.00018 ml Air has 0.00128 ml Carbon dioxide has 0.001977 ml water has 1.00 ml
What is the difference between an oil and gas well test?
The difference is that,an oil is a dark viscous liquid with high density and low rate of diffusion why gas is a well pronounce substance with low density and rate of diffusion. The difference is that,an oil is a dark viscous liquid with high density and low rate of diffusion why gas is a well pronounce substance with low density and rate of diffusion.
What is the full name for HDPE?
high density polymers
Why diffusion is maximum in gases?
rate of diffusion is inversely proposnal to density, density of gas is less. so diffusion rate is high
