Questions 35-36 refer to the experiment described below. H2 gas and N2 gas were placed in a rigid ve — Equilibrium Chemistry Question
Question
Questions 35-36 refer to the experiment described below.
H2 gas and N2 gas were placed in a rigid vessel and allowed to reach equilibrium in the presence of a catalyst according to the following equation.
3 H2(g) + N2(g) ⇄ 2 NH3(g) ΔH° = -92 kJ/molrxn
The diagram below shows how the concentrations of H2, N2, and NH3 in this system changed over time.
[VISUAL]
Which of the following was true for the system between time t1 and time t2 ?
A.
The concentration of N2 decreased.
B.
The temperature of the system decreased.
C.
The number of effective collisions between H2 and N2 was zero.
D.✓ Correct
The rates of the forward and reverse reactions were equal.
E.
The rate of formation of NH3 molecules was equal to the rate of disappearance of H2 molecules.
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