Posted by Anonymous on Monday, January 23, 2012 at 1:32am.
I have news for you. CaCO3 is 40% by mass Ca and not 12.0%. (Actually 40.04%).
So if you want 1.2 g you would take
0.40x = 1.2 and x = 1.2/0.4 = 3.0 g CaCO3.
But your problem is worked the same way.
0.12x = 1.2 and x = 10 g. Check your figures. I can assure that CaCO3 is 40% Ca and not 12%.
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