Hướng dẫn giải

Giả sử mỗi chất là 1 mol.

${{\text{m}}_{{{\text{H}}_{\text{2}}}}}\text{=2  gam; }{{\text{m}}_{{{\text{N}}_{\text{2}}}}}\text{=28 gam; }{{\text{m}}_{\text{C}{{\text{O}}_{\text{2}}}}}\text{=44 gam}$

Ở đktc, ${{\text{V}}_{{{\text{H}}_{\text{2}}}}}\text{=}{{\text{V}}_{{{\text{N}}_{\text{2}}}}}\text{=}{{\text{V}}_{\text{C}{{\text{O}}_{\text{2}}}}}\text{=22,4 (l)}$