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For a first-order reaction, the half-life is constant. It depends only on the rate constant and not on the reactant concentration. It is expressed as: t1/2 0.693/k. For a second order reation, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as: t1/2=1/k[A]0.
a.) A certain first-order reaction (A---> products) has a rate constant of 6.00×10?3 s-1 at 45 degrees C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?
B.) A certain second-order reaction (B---> products) has a rate constant of 1.70×10?3 at 27 degrees C and an initial half-life of 288s. What is the concentration of the reactant B after one half-life?
Saturated sodium chloride. describe what happens when 12 M HCl is added to saturated (5.4 M) NaCl. Calculate [Cl-] in the original solution and after the addition of the 12 M Hcl (before any precipitate forms).
A large gas flask is found to weigh 143.567 g. it is then filled with gas to a pressure of 735 torr at 31 C and found to weigh 1067.9 g (the density of water is 31 C is 0.997 g/mL). Assuming that the ideal gas equation applies, calculate the molar..
The rotation constant for H2 is 60.80 cm-1 the harmonic frequency is 4395.3 cm-1 and the anharmonicity constant is 117.90 cm-1. calculate the frequency at which the Q branch first overtone will be found.
For a protein w/ a molar mass of 1x10 6 u, calculate the molar concentration required to obtain an osmotic pressure of 10 matm at 25 degrees C
Determine the volume of sulfuric acid solution needed to prepare 37.4 g of aluminum sulfate, Al2(SO4)3, by the following reaction
NO(2) + CO--> NO +CO(2) is 125 Kj/mol and delta E for reaction is -216 kJ/mol. What is the activation energy for the reverse reaction. (NO+CO(2)--> NO(2) +CO
Determine KM for glucose oxidase. KM = M. B. Determine effect on the maximal rate if the concentration of adenine is 0.001 M. Vmax,I = mmol/min.
Carbon and silicon belong to the same group and are known to have similar properties
To isolate the barium ion the hydrate was reacted with sodium carbonate to from a white precipitate of barium carbonate. Data from this reaction is given below:
A biological sample was submitted to you lab for a nickel assay. Assume you are assaying a 2.06 g tissue sample for the presence or absence of nickel at the 0.1ppb (m/m) level
Small air bubbles in the salt bridge may not be a problem. How can the presence of air bubbles in the salt bridge alter the effectiveness of this salt bridge
The freezing point of t-butanol is 25.50°C and Kf is 9.1°C·kg/mol. Usually t-butanol absorbs water on exposure to air. If the freezing point of a 12.0 g sample of t-butanol is 24.59°C, how many grams of water are present in the sample?
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