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For the isomerization of CH3NC, Ea = 161.0 kJ/mol and k = 0.4100 at 600.0 K. At what temperature (Kelvin scale) is k = 6.245 s−1?
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- Actually, the carbon in CO2(g) is thermodynamically unstable with respect to the carbon in calcium carbonate(limestone). Verify this by determining the standardGibbs free energy change for the reaction of lime,CaO(s), with CO2(g) to make CaCO3(s).For the common allotropes of carbon (graphite and diamond), C(gr) ⟷⟷ C(dia) with equilibrium constant K = 0.32. The molar volumes of graphite and diamond are, respectively, 5.30 cm3/mol and 3.42 cm3/mol; ΔHf of diamond is 1.90 kJ/mol. These data suggest that the formation of diamond is favored at Group of answer choices None of the answers is correct. low temperatures and high pressures. high temperatures and high pressures. low temperatures and low pressures. high temperatures and low pressures.In a study of glass etching, a chemist examines the reaction between sand (Sio2) and hydrogen fluoride at 150°c (given by the reaction below). Predict the effect on [SIF4] when (a) H2O(g) is removed; (b) some liquid water is added; (c) HF is removed; (d) some sand is removed. SiO2(s) + 4HF(g) = SiF,(g) + 2H2O(g) O (a) decreases; (b) decreases ; (c) decreases ; (d) no effect O (a) increases; (b) decreases ; (c) decreases ; (d) no effect O (a) increases; (b) increases; (c) decreases; (d) no effect (a) no effect; (b) decreases; (c) decreases ; (d) no effect
- (c) According to Le Chatelier's principle, what conditions of (i) Temperature and (ii) pressure would benefit the industrial preparation of Sulphur trioxide (SO3) 2SO2(g) + O2SO3(g) AH =An instant cold pack purchased in a pharmacy contains a packet of solid ammonium nitrate surrounded by a pouch of water. When the packet of NH4NO3 is broken, the solid dissolves in water and cooling of the mixture occurs because the solution process for NH4NO3 is endothermic. Explain, in terms of what happens to the molecules and ions, why this mixing occurs spontaneously. Select all that apply. In solution, the ions NH4* and NO3 are highly ordered throughout the solvent. In the solid, the ions in NH4NO3 are highly ordered. In solution, the ions NH4+ and NO3 are randomly distributed throughout the solvent. The increase in randomness makes the process spontaneous. The decrease in randomness makes the process spontaneous.Calculate the equilibrium partial pressure of NO2 and N2O4.
- Calculate the lattice energy of AgBr(s) using the following thermodynamic data (all data is in kJ/mol). Ag(s) ΔHsublimation = 265 kJ/mol Ag(g) Ionization energy = 711 kJ/mol Br-Br(g) Bond energy = 173 kJ/mol Br(g) Electron affinity = -345 kJ/mol AgBr(s) ΔH°f = -120 kJ/mol ______________ kJ/molThe interhalogen compound BrF3 is a volatile, straw-colored liquid. The compound exhibits appreciable electrical conductivitybecause of autoionization (“solv” refers to BrF3 as the solvent):2 BrF3(l) ⇌ BrF2+(solv) + BrF4- (solv)(a) What are the molecular structures of the BrF2+ and BrF4- ions?(b) The electrical conductivity of BrF3 decreases with increasing temperature. Is the autoionization process exothermic or endothermic?(c) One chemical characteristic of BrF3 is that it acts as a Lewis acid toward fluoride ions. What do we expect will happen whenKBr is dissolved in BrF3?The breaking of the O-O bond in peroxydisulfuryl difluoride (FO,SOOSO,F) gives FO,SO: (FO2SO)2 2 2 FO2SO The compound on the left of this equation is a colorless liquid that boils at 67.1°C. Its vapor, when heated to about 100°C, turns brown as the product of the reaction forms. Suppose that, in a sample of the vapor, the intensity of the brown color doubles between 100°C and 110°C and that the total pressure increases only by the 2.7% predicted for an ideal gas. Estimate AH° for the preceding reaction.
- (a) The electrostatic force (not energy) of attraction betweentwo oppositely charged objects is given by the equationF = k(Q1Q2>d2) where k = 8.99 x 109 N-m2/C2, Q1 andQ2 are the charges of the two objects in Coulombs, and d isthe distance separating the two objects in meters. What isthe electrostatic force of attraction (in Newtons) between anelectron and a proton that are separated by 1.00 x102 pm?(b) The force of gravity acting between two objects is givenby the equation F = G(m1m2>d2), where G is the gravitationalconstant, G = 6.674 x10-11N-m2/kg2, m1 and m2 arethe masses of the two objects, and d is the distance separatingthem. What is the gravitational force of attraction (inNewtons) between the electron and proton? (c) How manytimes larger is the electrostatic force of attraction?Using the thermodynamic tables and the enthalpy of formation for one mole of potassium chlorate solid, find the enthalpy change for formation of 15.0 g KClO3 (s) a. – 48.7 kJ b. + 5.97 x 103 kJ c. – 397.7 kJ d. – 3.25 kJ e. – 5.97 x 103 kJ f. none of theseIf Gibbs free energy (at standard conditions) of a reaction is -22.8 kj/mol, what is the equilibrium constant of the reaction?
