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perchè una mole di fosfato di bario 〖Ba〗_3(〖PO〗_4)_2 ?
perchè una mole di fosfato di bario 〖Ba〗_3(〖PO〗_4)_2 che pesa 601,96 grammi contiene 1,2×〖10〗^24 atomi di fosforo?????
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