The equation below represents the equilibrium state of aqueous phosphoric acid. H3PO4(aq) ↔ H+(aq) + H2PO4-(aq)

Which of the following is equal to the ionization constant Ka?
A
[H2PO−4][H+][H3PO4]

B
[H+][H3PO4][H2PO4]

C
[H+][H2PO−4][H3PO4]

D
[H3PO4][H+][H2PO−4]

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.