Визначте невідомі речовини А, В, С в наступних схемах реакцій:
1) А Fe 2 O 3  +B ; SO 3 +B →C ;  Fe 2 O 3  + C → Fe 2 (SO 4 ) 3  +B
2) A CaO + B; P 2 O 5 + B → C; CaO + C → Ca 3 (PO 4 ) 3 + B
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