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- The following equation represents a reversible decomposition: CaCO3(s)CaO(s)+CO2(g) Under what conditions will decomposition in a closed container proceed to completion so that no CaCO3 remains?arrow_forwardSilicon forms a series of compounds analogous to the al-kanes and having the general formula SinH2n+2. The first of these compounds is silane, SiH4, which is used in the electronics industry to produce thin ultrapure silicon films. SiH4(g) is somewhat difficult to work with because it is py-ropboric at room temperature—meaning that it bursts into flame spontaneously when exposed to air. (a) Write an equation for the combustion of SiH4(g). (The reaction is analogous to hydrocarbon combustion, and SiO2 is a solid under standard conditions. Assume the water produced will be a gas.) (b) Use the data from Appendix E to calculate ? for this reaction. (c) Calculate G and show that the reaction is spontaneous at 25°C. (d) Compare G for this reaction to the combustion of methane. (See the previous problem.) Are the reactions in these two exercises enthalpy or entropy driven? Explain.arrow_forwardWrite a rate law for NO3(g) + O2(g) NO2(g) + O3(g) if measurements show the reaction is first order in nitrogen trioxide and second order in oxygen.arrow_forward
- A general reaction written as A + 2B → C + 2D is studied and yields the following data: [A]0 [B]0 Initial Δ[C]/Δt 0.150 M 0.150 M 8.00 × 10–3 mol/L·s 0.150 M 0.300 M 1.60 × 10–2 mol/L·s 0.300 M 0.150 M 3.20 × 10–2 mol/L·s Determine the initial rate of C production (Δ[C]/Δt) if [A] = 0.200 M and [B] = 0.500 M. arrow_forwardThe activation energy for the decomposition of hydrogen peroxide is 41.0 k.J/mol. When the reaction is catalyzed by the enzyme catalase, it is 7.00 kJ/mol. 2H,O,(aq) → 2H,01) + O2(g) Calculate the temperature that would cause the nonenzymatic catalysis to proceed as rapidly as the enzyme-catalyzed decomposition at 20.0°C. Assume the frequency factor, A, to be the same in both cases. Report your answer to 3 significant figures. x 10 Karrow_forwardWhat is the activation energy for a reaction if k = 1.89 × 10–1 s–1 at 541 Kelvin and k = 7.31 s–1 at 601 Kelvin, in kJ/mol? Report an integer value, without units.arrow_forward
- A particular second-order reaction has a rate constant of 2.4 x 10–6 M–1 s–1 at 575 K and 6.0 x 10–5 M–1 s–1 at 630 K. (a) Calculate the activation energy of the reaction. (b) What is the value of the rate constant at 25°C?arrow_forwardFor the reaction BrO3– + 5Br–+ 6H+ → 3Br2 + 3H2O at a particular time, –Δ[BrO3–]/Δt = 1.5 × 10–2 M/s. What is –Δ[Br–]/Δt at the same instant?arrow_forwardCalculate the activation energy, Ea, for N205(g) → 2 NO2(g) + 1/2 O2(g) given k (at 45.0 °C) = 5.79 × 10-4s-1 and k (at 60.0 °C) = 3.83 × 10-3 s-1. (R = 8.314 J/K• mol) Answer:arrow_forward
- The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy E=22.0 kJ/mol. If the rate constant of this reaction is 1.1 x 108 M¹s¹ at 309.0 °C, what will the rate constant be at 277.0 °C? Round your answer to 2 significant digits. k = M¹ s ? dlarrow_forwardConsider the reaction A(aq) = 2B(aq) where Kc = 4.1 at 25 °C. If 1.5 M A(aq) and 0.50 M B(aq) are initially present in a 1.0 L flask at 25 °C, what change in concentration (if any) will occur in time?arrow_forwardHydrogen gas and iodine vapor react as H2(g)+ I2(g) → 2HI(g). The activation energy of the formation of HI is 1.03x102 kJ whereas the activation energy of the dissociation of HI is 1.77x102 (a). Calculate the enthalpy of reaction for the reaction. (b). Sketch the energy profile for the reaction between hydrogen and iodine. Platinum acts as a catalyst for the reaction above. Sketch the energy profile for the catalyzed reaction in the energy profile. (c). Name the type of catalysis involved and explain qualitatively how the presence of platinum catalyzes the reaction above.arrow_forward
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