Question

In a typical fuel cell, the reactant (R) and product (P) are

(1) R = H_2(g) · N_2(g) : P = NH_3(aq)

(2) R = H_2(g) · O_2(g) : P = H₂O_2(l)

(3) R = H_2(g) · O_2(g) : P = H₂O_(l)

(4) R = H_2(g) · O_2(g) · Cl_2(g) : P = HClO_4(aq)