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M CaSO₄=134g
134g-100%
64g - x
x=47,76%
Masa cząsteczkowa CaSO4(gips palony) : 40u+32u+16u*4
M CaSO4=136u
M O4= 64u
136u - 100%
64u - x
x=64u*100% / 136u
x=6400%/136
x=47,06%
Zawartośc procentowa tlenu w gipsie palonym CaSO4 wynosi 47,06%
Pozdrawiam ;)