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# Chemistry - Chlorine watch

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1. Why exactly does chlorine have a RAM of 35.5?

GCSE Level.
Thanks
2. Ermm its to do with its isotopes. Theres a calculation that uses its isotopes to work out the relative mass and the average works as that.
3. (Original post by koldtoast)
Why exactly does chlorine have a RAM of 35.5?

GCSE Level.
Thanks
cos there is roughly equal amounts of different chlorine isotopes. 35 and 36 i think.
4. (Original post by koldtoast)
Why exactly does chlorine have a RAM of 35.5?

GCSE Level.
Thanks

The chlorine 35 isotope is three times more abundant.
5. (Original post by Ralfskini)
The chlorine 35 isotope is three times more abundant.
thats it. its 35 and 37 not 36. my mistake.
6. Three times more abundant than what? THe other two isotopes Cl 35 and 37?
7. The RAM is the weighted mean of the isotopes.

An ordinary sample of naturally occuring chlorine will contain roughly 75% chlorine-35 and 25% chlorine-37.

So the RAM is (35*0.75)+(37*0.25) = 35.5
8. (Original post by hitchhiker_13)
The RAM is the weighted mean of the isotopes.

An ordinary sample of naturally occuring chlorine will contain roughly 75% chlorine-35 and 25% chlorine-37.

So the RAM is (35*0.75)+(37*0.25) = 35.5
Oh right I think I get it now thanks

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