C-06-Q139mediumsingle_mcqIn N2+3H2→2NH3\mathrm{N_2 + 3H_2 \to 2NH_3}N2+3H2→2NH3 at STP, NH3\mathrm{NH_3}NH3 volume from 4 L N2\mathrm{N_2}N2—a2 Lb4 Lc8 Ld22.4 L