Use the summaries to locate questions in the original paper. Select a question or its button to reveal the answer. Calculations and proofs include the essential steps.
Labels: E = worked example, C = class practice, H = homework; P1-P4 refer to original PDF pages. Other labels follow the original question or section numbering.
D
D
C
B, C
A, C
A, B
Steps 2 and 4. Near $500^\circ\mathrm C$, the iron catalyst is active, balancing reaction rate and equilibrium yield. Recycling improves overall feed utilization, not equilibrium conversion at fixed conditions.
B, C
Endothermic; $\mathrm{N_2(g)+3H_2(g)\rightleftharpoons2NH_3(g)}$, $\Delta H=-92\ \mathrm{kJ\,mol^{-1}}$; B.
Hot Fe sites promote $\mathrm{N\equiv N}$ cleavage and reaction rate; cooler Ti sites favor exothermic ammonia formation and improve yield.
$\Delta H=(b/2-3a)\ \mathrm{kJ\,mol^{-1}}$
B
A, C
$T_1>T_2$;$K=8.33\ \mathrm{L^2\,mol^{-2}}$
ab: pressure favors the forward reaction, which reduces gas moles. cd: very high pressure may liquefy ammonia or impede its desorption, reducing its gas-phase fraction.