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2003 - Multiple Choice - Q5 little help needed please

bigears1

Posted 26 May 2005 - 02:44 PM

5.) A mixture of sodium chloride and sodium sulphate is known to contain 0.6 mol of chloride ions and 0.2 mol of sulphate ions.

How many moles of sodium ions are present.

A 0.4
B 0.5
C 0.8
D 1.0

how do you do this???

Thanks

david__taylor

Posted 26 May 2005 - 03:34 PM

Is the answer D. 1?

I got this by:

...........NaCl.................................................................Na2 SO4
1mole Cl <---> 1 mole Cl..................................2mole Na<---> 1 mole SO4
0.6mole Cl -> 0.6 mole Na....................................0.2mole SO4 <---> 0.4mole Na.

0.6 + 0.4 = 1.0mole of Na? Am i right, that's how my teacher told me how to do a question like that as I got stuck on a similar one.

bred

Posted 26 May 2005 - 03:40 PM

Yep.

bigears1

Posted 26 May 2005 - 03:55 PM

I see now, thanks a lot!

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