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let's say you don't know much of the concept of resins
but in the question it says, "Exchanging Ions"
so obviously Na+ is exchanged by Ca2+
there is a 2+ charge on Ca, that means it will need 2 molecules of C8H7SO3- for one molecule of Ca
they asked it to express in mole per gram resin
so 1 mole of Ca per 2 mole of resin
1/(2*206) (molar mass given)
ans : 1/412
@Orewash ^
okie dhanyavaad
oh u got it ?
ya
nice!
+fsolved
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