H_{2 (g)} + Cl_{2 (g)} → HCl _(g)

H_{2 (g)} + Cl_{2 (g)} → 3 HCl _(g)

H_{2 (g)} + Cl_{2 (g)} → 4 HCl _(g)

H_{2 (g)} + Cl_{2 (g)} → 2 HCl _(g)

(l)

(aq)

(s)

(g)