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There is no significant amount of chlorine in the composition of air. If chlorine is released into the air, because it is more dense than air, it tends to collect near the ground.

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Q: How much percentage does chlorine have in the air?
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Does it matter what brand of chlorine you use as long as it contains the same available chlorine?

If the available chlorine is the same percentage then they are the same.


What is the percentage by mass of chlorine in CHCl3?

89%


Is chlorine less dense than air?

yes chlorine is mare dense than air because a liquid is much more denser than air right ok for a start chlorine is a gas so don't get confused with chlorine dissolved in water and secondly you are correct it is denser than air as a gas because it has stronger forces between molecules because it is more electronegative than nitrogen and oxygen that make up 99 percent or air if you are wondering how then in chlorofluorocarbons or (CFC'S) reach the stratosphere it is because the wind carries them up even though they are in fact denser than air and the weight causing gravity is nothing compared to the power of the wind.


What data would be use to find out how much water vapor is in the air?

Look in the weather reports for "Relative Humidity". It is a percentage of how much water vapor is in the air compared to what the air can actually hold at a given temperature.


Is chlorine gas heavier then air and why?

Yes, chlorine gas is about 2.5 times heavier than air. At standard conditions (pressure = 101.325 kPa and tenmperature = 15 degC), the density of chlorine gas is 3.04 kg/m3 and the density of air in 1.202 kg/m3. This means that chlorine gas will not 'rise' and tend to stay low on the ground. This causes many problems with ventilation.