76. For the stepwise dissociation of aqueous H3P04, which of the following is not a conjugate acid-base pair? _ (A)HPO4 2-andPO43- (B) H3PO4, and H2PO4- (C)H2P04- andHP04 2-(D) H2PO4- and Po43- (E) H3O+ and H20

77. Nitrogen gas (N2) reacts with hydrogen gas (H2) to form ammonia (NH3). At 200°C in a closed container, 1.0 atm of nitrogen gas is mixed with 2.0 atm of hydrogen gas. At equilibrium, the total pressure is 2.0 atm. Calculate the partial pressure of hydrogen gas at equilibrium. (A) 2.0 atm (B) 0.50 atm (C) 1.5 atm (D) 0.0 atm (E) none of these

76. For the stepwise dissociation of aqueous H₃P0₄, which of the following is not a conjugate acid-base pair? _
(A)HPO₄ ^2-andPO₄^3-
(B) H₃PO₄, and H₂PO₄^-
(C)H2P0₄^- andHP0₄ ^2-
(D) H₂PO4^- and Po4^3-
(E) H₃O⁺ and H₂0

其他試題