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Which of the following anions is the most nucleophilic in an SN2 reaction? A) h2c=ch- B)ch3ch2- C)ch-triplebonds-C A) B B) C C) A
What is the final concentration of a BSA solution made from 400 uL of stock BSA solution (initial concentration 500 mg/mL) diluted with 1600 uL of water
consider a hydrogen atom in the ground state. what is the energy of its electron? Now consider an excited- state hydrogen atom. what is the energy of the electron in the n=2 level
Consider a system with four energy levels: 0E, 1E, 2E, 3E, where E is kT (E can be represented by epsilon and T is 100K). Assume that there are 10 particles. Provide an expression for energy, heat capacity and entropy. Plot all as a function of T
What mass of sodium fluoride must be added to 250. mL of a 0.100 M HF solution to give a buffer solution having a pH of 3.50? (Ka(HF) = 7.1 ´ 10-4)
The annual production of sulfur dioxide from burning coal and fossil fuels, auto exhaust and other resources is about 26 million tons. the equation for the reaction is S + O2= SO2.
Given the following: 3648 L of wine, pH is 3.24, FSO2 is 24mg/L, TSO2 is 89 mg/L, alcohol is 12.6%. You want to maintain a MSO2 of at least 0.8 mg/L. How many mL of 95% pure SO2 liquid that has a density of 1.46 g/ml would you add
What are the entropy change and Gibbs energy change on mixing to produce a benzene-toluene solution with 1/3 mole fraction benzene at 25C
Write the simplest balanced equations, and find the actual relative masses of the elements. Explain your reasoning.
What two properties of ATP make it ideally useful for a form of energy storage in cells? Describe why the hydrolysis of ATP is highly exergonic (give at least two reasons).
A 1.90 gram sample of a salt dissolves in 9.10 g of water to give a saturated solution at 21 Celsius
When 0.539 L of Ar at 1.20 atm and 227°C is mixed with 0.223 L of O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is the pressure in the flask
You use 27.5 mL of NaOH to titrate 100.0 mL of HCl and 18.4 mL of NaOH to titrate 50.0 mL of 0.0782 M H2SO4. What are the concentrations of the HCl and NaOH respectively?
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