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Wapień - CaCO3.
m CaCO3=40[u]+12[u]+48[u]=100[u].
%Ca=(40[u]*100%)/100[u]=40%.
Woda wapienna - Ca(OH)2.
m Ca(OH)2=40[u]+34[u]=74[u].
%Ca=(40[u]*100%)/74[u]=54,1%.