Assume for some DNA (molar mass: 10000DA), the AGº of denaturation is -20KJ/mol at 350K. In an experiment we dissolve 1g of the dsDNA in 1L of water at 350K. At the very beginning (t=0), all the sample was in the double helix form. What is the reaction quotient Q at
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- In a study of the rearrangement of cyclopropane to propene at 500 °C (CH2)3 CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -1.01x10-3 s-1 and a y-intercept of -2.42 . Based on this plot, the reaction is first e order in (CH2)3 and the rate constant for the reaction is s-1.3. (а) A laboratory manager performed an experiment to investigate the hydrolysis of 2-chlorooctane at different temperatures. The following results were obtained: Temperature (°C) Rate constant, k, (s1) | 1.06 x 10-5 | 3.19 x 10-4 | 9.86 x 104 | 2.92 x 10-3 25 35 45 Using a graphical method, calculate pre-exponential factor k value at 50 °C (ii) (ii)Aktiv Chemistry ← → C tab shift + esc caps lock X https://app.101edu.co ! Aktiv Chemistry 40% Phthalonitrile (CHN) is produced by the ammoxidation of o-xylene (C₂H₁) according to the following reaction: 8 C₂H₁(1) + O₂(g) + NH₂(g) → C₂H₂N₂(s) + H₂O(l) 8 10 8 4 How many moles of water would be produced by the complete ammoxidation of 130.0 grams of o-xylene? 2 F2 N W S #3 20 F3 E X 30 $ 4 X + D 8888 F4 R C LO LO % 5 F F5 T Question 12 of 17 V G Y 7 F7 H B U 00 DII F8 J F9 K 4 N M +/- 1 7 70 I F10
- In a study of the rearrangement of cyclopropane to propene at 500 °C (CH₂)3 CH3CH=CH₂ the concentration of (CH₂)3 was followed as a function of time. It was found that a graph of In[(CH₂)3] versus time in seconds gave a straight line with a slope of -9.38×104 s¹ and a y-intercept of -2.02. Based on this plot, the reaction is order in (CH₂)3 and the rate constant for the reaction isIn a study of the rearrangement of cyclopropane to propene at 500 °C (CH2)3 CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -9.38×104 s1 and a y-intercept of -1.57 . Based on this plot, the reaction is O order in (CH2)3 and the half life for the first reaction is seconds.Consider the following elementary reaction (seen in air pollution) that goes through a a theoretically proposed transition state: NO2 (9) + NO2 (9) – > (0ON – NOO)* – > N204 (9) Molecule Energy in kJ/mol Entropy in J/(mol*K) NO2 -535913 240 (OON-NOO); -535854 400 N204 -107439 304 Use collision theory to estimate the second order rate constant at 25 °C using that the hard sphere molecular cross section is 0.60 nm².
- Writing the rate law implied by a simple mechanism Suppose the formation of tert-butanol proceeds by the following mechanism: step elementary reaction rate constant 1 (CH,),CBr(aq) → (CH3),C"(aq) + Br (aq) 2 (CH3),C"(aq) + OH (aq) → (CH3),COH(aq) kz Suppose also k,»k,. That is, the first step is much faster than the second. olo Write the balanced chemical equation for the overall chemical reaction: Write the experimentally- observable rate law for the overall chemical reaction. rate = k I Note: your answer should not contain the concentrations of any intermediates. Express the rate constant k for the overall chemical reaction in terms of k1, k2, and (if necessary) the rate constants k-1 and k.2 for k = the reverse of the two elementary reactions in the mechanism. olo ||Consider the reaction: NO(g) + C₂H₂(g) → HCN(g) + CO(g) + H(g), is The Arrhenius expression for the reaction is k(T) = 8.97 x 10-¹2 cm³ molec-¹ s¹ exp{-218 kJ mol-¹/RT} over the temperature range 1100 - 1500 K. Using transition state theory, calculate AH* and AS* for this reaction at 1300 K.An enzymatic hydrolysis of fructose-1-phosphate, fructose-1-P + H20 fructose + Pi was allowed to proceed to equilibrium at 25°C. The concentrations used in the reaction were lower than typical because a delicate enzyme was used - this is a typical modification used by biochemists that are valid for biochemical standard state (in this context). The original concentration of fructose-1-P was 0.2M, but when the system had reached equilibrium the concentration of fructose-1-P was only 6.52 x 10 5 Which of the below values comes closest to representing the free energy of hydrolysis of fructose-1-P?
- Given that the reaction of C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (1) AH = - 1411 kJ What would AH be for 2 CO2 (g) + 2 H2O (1) → C,H4 (g) + 3 O2 (g) () 1411 J -1411 J O-1411 kJ 1411 kJFor the gas phase decomposition of cyclobutane,(CH2)4----->2 C2H4the rate constant in s-1 has been determined at several temperatures. When ln k is plotted against the reciprocal of the Kelvin temperature, the resulting linear plot has a slope of -3.15×104 K and a y-intercept of 35.9.The value of the rate constant for the gas phase decomposition of cyclobutane at 711 K is _____ s-1.(Enter your answer to one significant figure.)Q.51 For a bimolecular gas phase reaction P + Q R, the pre-exponential factor is 1 x 1013 dm mol s. The standard entropy of activation at 25 °C JK- mol. (Round off to two decimal points) is (The standard concentration c° = 1 mol dm³; Planck constant h = 6.62 × 10-34 J s; Boltzmann constant kB = 1.38 × 10-23 J K-1; Gas constant R = 8.31 J mol K1)