a)Cu2CO3......węglan miedzi(I)
mCu2CO3=2*64u+12u+3*16u=188u
188g Cu2CO3-----100%
48g tlenu-----------x%
x=25,5% tlenu
b)Mg3(PO4)2..fosforan(V) magnezu
mMg3(PO4)2=3*24u+2*31u+8*16u=262u
262g Mg3(PO4)2----100%
128g tlenu-------------x%
x=48,8% tlenu
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a)Cu2CO3......węglan miedzi(I)
mCu2CO3=2*64u+12u+3*16u=188u
188g Cu2CO3-----100%
48g tlenu-----------x%
x=25,5% tlenu
b)Mg3(PO4)2..fosforan(V) magnezu
mMg3(PO4)2=3*24u+2*31u+8*16u=262u
262g Mg3(PO4)2----100%
128g tlenu-------------x%
x=48,8% tlenu