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2004 - Multiple Choice - Q5

rscott

Posted 23 May 2006 - 11:22 AM

Could anyone explain this question to me, because I really don't know how to approach it. I would type it up, but it would take ages!

cheers biggrin.gif

Pammy

Posted 23 May 2006 - 12:48 PM

You just need to find the mass of each of the atoms.
For example the first one, power1.gif H base2.gif power1.gif power6.gif O tells us there are 2 hydrogen ions, whose mass each is one, therefore the total mass of the hydrogen ion = 2, there is only one oxygen, and the mass number is 16, therefor total mass of atom= 18

IF go go through this for all of them you should get
1. 18
2. 19
3. 20
4. 20
5. 21
6. 22

From this you can see 3 & 4 are the same, which makes the answer D
Hope this helps

rscott

Posted 23 May 2006 - 03:39 PM

Ah, I get it now! I was getting confused with all the numbers & brackets. Thanks for the help biggrin.gif

Pammy

Posted 23 May 2006 - 04:06 PM

Yeah there are too many symbols and numbers in it
I had 2 ask my teacher how to do it
Glad it helped you biggrin.gif

Misbah

Posted 24 May 2006 - 02:02 PM

yes it is rather confusing!!

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