a)
m Al2O3= 2*27u+3*16u=54u+48u=102u
b)
m Pb3O4= 3*207u+4*16u= 621u+64u=685u
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a)
m Al2O3= 2*27u+3*16u=54u+48u=102u
b)
m Pb3O4= 3*207u+4*16u= 621u+64u=685u