text: The balanced chem. equation is:\n\n3H2(g) + N2(g)  --> 2NH3(g)\n\na.\n\n1 L of N2 gives 2 L of NH3 at stp\n25 L of N2 gives 2*25 = 50 L of NH3 measured at stp.\n\nb. I suppose that N2 is also at 25 oC.\n\n1 L of N2 reacts with 3 L of H2\n398 L of N2 reacts with 3*398 = 1194 L of H2.\n\nc.\n\n1 L of N2 reacts with 3 L of H2\n9.56 L of N2 reacts with 3*9.56 = 28.68 L H2\n\nBut we have 27.1 L < 28.68 L of H2. So H2 is the limiting reagent ant reacts fully:\n\n3 L of H2 gives 2 L of NH3\n27.1 L of H2 gives 2*27.1/3 = 18.67 L of NH3