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A. NO = 30
B. H2O = 18
2. KH2PO4 = 272/2 = 136 gramos
136 g KH2PO4 x _1_Mol_____ = 0.5 Moles
272 gramos
3. 3 Ag + 4 HNO3 = 3 AgNO3 + NO + 2 H2O.