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Al2 o3 = 54g+48g=102g
Mg3(PO4)2=72g+62g+128g=262g
m Al2 o3 =2*27u+3*16u=54u+48u=102u
m Mg3(PO4)2= 3*24u+2*31u+8*16u=72u+62u+128u=262u
2*27+3*16=102
3*24+2*31+8*16=262