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Ca3(PO4)2 - fosforan (V) wapnia
m Ca = 40u
m P = 31u
m O = 16u
m Ca3(PO4)2 = 3*40u + 2*(31u + 4*16u) = 310u
Masa cząsteczkowa Ca3(PO4)2 = 40*3 + 2*(31 + 4*16) =310 [u]