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Masa Ca = 40g
Masa O = 16g
Masa H = 1g
Masa
100% --------------- 74g
x% -------------------- 40g Ca
x = 54,05% >> zawartość % Ca
100% -------------- 74g
y% --------------- 2*16g O
y = 43,24% >> zawartość % tlenu
100% - 54,05% - 43,24% = 2,71% >> zawartość % wodoru
%m. Ca= 40/74 x 100%=54,05%
%m. O= 32/74 x 100%=43,24%
%m. H= 2/74 x 100%= 2,71%