Ответ:
1 строка
P205
2*Ar(P) + 5*Ar(O) = 2*31 + 5*16 = 62 + 80 = 142 a.o.m
2 строка
Al2O3
2*Ar(Al) + 3*Ar(O) = 2*27 + 3*16 = 54 + 48 = 102 a.o.m
3 строка
SO3
1*Ar(S) + 3*Ar(O) = 1*32 + 3*16 = 32 + 48 = 80 a.o.m
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Ответ:
1 строка
P205
2*Ar(P) + 5*Ar(O) = 2*31 + 5*16 = 62 + 80 = 142 a.o.m
2 строка
Al2O3
2*Ar(Al) + 3*Ar(O) = 2*27 + 3*16 = 54 + 48 = 102 a.o.m
3 строка
SO3
1*Ar(S) + 3*Ar(O) = 1*32 + 3*16 = 32 + 48 = 80 a.o.m