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Why is a sample of helium is more dense than a sample of hydrogen under the same conditions?
Wiki User
∙ 14y ago
Avagadro's hypothesis was that at a constant pressure and temperature, the number of molecules of two gases at equal volumes will be the same. This is true in that there is always one mole of gas per 22.4 liters no matter what the gas is. However, each gas has a different molarity, or grams per mole. This means that although each gas will have one mole in 22.4 liters, they will have different weights. For example, hydrogen contains 2.02 grams per mole, while helium contains 4 grams per mole. Therefore, at a constant pressure and temperature hydrogen and helium have different weights at the same constant volume.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoThe density of a gas is proportional to its molecular or atomic weight.
Hydrogen has a molecular mass of about 2, while helium has an Atomic Mass of about 4. Therefore, helium is about twice as dense as hydrogen.
Wiki User
∙ 15y agoHydrogen has 1 proton and Helium has 2 protons and 2 neutrons. Neutrons and protons weigh approximately the same. Electrons have very little, if any weight. Therefore Helium is about 4 times heavier than Hydrogen
Wiki User
∙ 14y agoThe gas laws state that two gasses under the same temperature and pressure will have the same number of molecules in the a same volume. Hydrogen is H2, which means the gas has two atoms of hydrogen per molecule. Nearly all the hydrogen is made up of the isotope having no neutrons and an atomic mass of about 1. Therefore the hydrogen molecule has two atomic mass units associated with it. Helium is inert, and the gas is all He atoms. Since most helium atoms have two neutrons in addition to the two protons, the atomic mass totals four. This means that a helium will be very roughly twice as dense as hydrogen.
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Is helium dense or less dense than water?
While the temperature and pressure a substance is under changes its density, it would take very high temperature and very low pressure on water and very low temperature and very high pressure on the hydrogen to make hydrogen more dense than water. So short answer, Hydrogen is less dense than water. While the temperature and pressure a substance is under changes its density, it would take very high temperature and very low pressure on water and very low temperature and very high pressure on the hydrogen to make hydrogen more dense than water. So short answer, Hydrogen is less dense than water.
What other properties of helium makes it good for filling airships?
It's very light (only hydrogen gas is less dense than helium), it's relatively cheap, and (most importantly) it's not flammable (hydrogen gas is--the Hindenburg was filled with hydrogen gas).
What are the properties of hydrogen which makes it suitable for filling meteorological balloons?
both helium gas and hydrogen gas are less dense than air and therefore they float in normal air. however hydrogen is also very flammable and so if it is to be used for a balloon be very cautious. the Hindenburg disaster is famous case of a balloon using hydrogen and having disastrous effects.
What chemical property of helium makes it a better choice than hydrogen for use in airships?
It's very light (only hydrogen gas is less dense than helium), it's relatively cheap, and (most importantly) it's not flammable (hydrogen gas is--the Hindenburg was filled with hydrogen gas).
How dense is helium compared with air?
Which is more dense: water or helium? - Water is more dense, because water does not float like helium does. It is below air. That's why we have oceans and lakes and rivers.
Does Jupiter have a dense core of hydrogen and helium?
No, it has a dense rocky core in the middle!!
Is helium dense or less dense than water?
While the temperature and pressure a substance is under changes its density, it would take very high temperature and very low pressure on water and very low temperature and very high pressure on the hydrogen to make hydrogen more dense than water. So short answer, Hydrogen is less dense than water. While the temperature and pressure a substance is under changes its density, it would take very high temperature and very low pressure on water and very low temperature and very high pressure on the hydrogen to make hydrogen more dense than water. So short answer, Hydrogen is less dense than water.
Why can gases such as helium escape earth's atmosphere?
Helium can escape because it is the least dense element after Hydrogen.
Why do balloons only float with helium?
they don't float ONLY with helium. They float with any gas that is less dense than air, for instance hydrogen.
What gas law explains the replacement of hydrogen to helium in blimps?
The replacement of hydrogen in blimps with helium is not based on the gas laws but rather on the fact that hydrogen is highly flammable whereas helium is entirely non flammable. In fact based on the gas laws hydrogen would actually be better for blimps because its has lower molecular mass and is therefore less dense than helium.
What is the atmosphere of Saturn like on Saturn?
it is dense mix of Hydrogen and trace gases ( like Helium, Methane, Ammonia)
What gases lift a balloon into the air?
Anything less dense than air (hydrogen, helium, hot air).
What makes balloons less dense air?
If a balloon is filled with a substance that's less dense than air ... such as helium, hydrogen, steam, or warmer air ... then the balloon is less dense than air.
What other properties of helium makes it good for filling airships?
It's very light (only hydrogen gas is less dense than helium), it's relatively cheap, and (most importantly) it's not flammable (hydrogen gas is--the Hindenburg was filled with hydrogen gas).
What is happening in the center of the sun?
one Helium is forming two Hydrogen in Fusion, and it is just dense, hot matter and gases.
Why is helium used in a zeppelin?
Helium is much less dense than air, meaning it can provide lift. The only gas lighter than helium is hydrogen, which is too dangerous to use for such a purpose because it is extremely flammable. Helium, on the other hand is completely nonflammable. Aside from hydrogen no other gas is anywhere near as light as helium.
Is gasoline more dense than both helium and hydrogen?
Much more dense. They are the two lightest gasses in the universe, and gasoline is a liquid, which is always denser than a gas.
