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Cate grame dehidroxid de aluminiu reactioneaza cu 12,6 g acid azotic?

Răspuns :

Al(OH)3 + 3 HNO3 => Al(NO3)3 + 3 H2O
78 g hidroxid.........3*63 g acid
x g hidroxid............12.6 g acid
x = 5.2 g hidroxid