The equilibrium NH3(aq) + H2O(l) ↔NH4+(aq) + OH−(aq) at 25 °C is subjected to a temperature jump which slightly increases the concentration of NH4+(aq) and OH−(aq). The measured relaxation time is 7.61 ns. The equilibrium constant for the system is 1.78 × 10−5 at 25 °C, and the equilibrium concentration of NH3(aq) is 0.15 mol dm−3. (a) Calculate the rate constant for the forward step. kf = _____________. Just value in 3 sig. fig., normal or exponential format,  e.g. type in 1.16E6 meaning 1.16 x 106, must use capital E here. Choose a unit in the next question, must be in one of those.

Consider the following elementary reaction: H,(9) +2NO(g) → N,0(g) +H,O(g) Suppose we let k, stand for the rate constant of this reaction, and k_, stand for the rate constant of the reverse reaction. Write an expression that gives the equilibrium concentration of H,O in terms of k, k_1, and the equilibrium concentrations of H, NO, and N,O. [H,0]= 0 %3D

Ammonia and oxygen react to form nitrogen and water, like this: 4NH, (g)+30, (g) → 2N,(g)+6H,0(g) Suppose a mixture of NH2, O,, N, and H,0 has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left. ol perturbation change in composition shift in equilibrium A to the right The pressure of O, will to the left Some NH, is removed. The pressure of N2 will O (none) to the right The pressure of NH3 will to the left Some N, is added. The pressure of O, will ? O (none)

Consider the chemical reaction described by 2A(aq) ⇌ D(aq)with rate constants k1 and k-1.  If the reaction is subject to a temperature jump, derive the equation for d[D]/dt in terms of a relaxation constant t.

A gas phase reaction has a rate coefficient of 1.3·104 L mol–1s–1 at 300 K and its activation energy is 8.3 kJ mol–1. Indicate the order of the reaction.

For the reaction 12(g) +Br₂(g) →21Br(g) Ke=280 at 150 °C. Suppose that 0.520 mol IBr in a 2.00-L flask is allowed to reach equilibrium at 150 °C. Esc Type here to search WE in R ▼ What is the equilibrium concentration of I₂? Express your answer in moles per liter to three signifi IVE ΑΣΦ [12] = 0.012 Submit Previous Answers Request Answer * Incorrect; Try Again; 7 attempts remaining Part C What is the equilibrium concentration of Br₂? Express your answer in moles per liter to three significant figu ΕΧΕΙ ΑΣΦ Br₂ = 0.0120 Submit Previous Answers Request Answer ? 8 M

Distinguish between a first-order phase transition, a second-order phase transition, and a λ-transition at both molecular and macroscopic levels.