H₂+ ? -> NH₃ NH₃+ ? -> NH₄Cl NH₄Cl+ ? -> HCl HCl + ? -> CaCl₂
H₂+ ? -> NH₃
NH₃+ ? -> NH₄Cl
NH₄Cl+ ? -> HCl
HCl + ? -> CaCl₂
3H₂+ N₂ -> 2NH₃ NH₃+ HCL -> NH₄Cl NH₄Cl+ H₂O -> HCl + NH₃ + H₂O 2HCl + Ca(OH)₂ -> CaCl₂ 2H₂O