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69.0 mL of a 1.30 M solution is diluted to a volume of 278 mL. A 139-mL portion of that solution is diluted using 151 mL of water. What is the final concentration
Which of the following terms would be used in a description of the mechanism of this reaction: a. tertiary carbanion b. 2-methylpentoxonium ion Torn between the two
He concluded that electrons are emitted only when intensity of light is increased. He observed a continuous spectrum of light when hydrogen gas was supplied with energy.
A 1.5991 g sample of a hydrocarbon is combusted to give 1.6918 g of H2O and 5.1661 g of CO2. What is the empirical formula of the compound
Which of the following is true about the photoelectric effect. a) The number of electrons emitted increases with intensity of light, regardless of the frequency. b) The number of electrons emitted
The reaction of coal and water at a high temperature produces a mixture of hydrogen and carbon monoxide gases. This mixture is known as synthesis gas (or syngas). What mass of water is required for
The vapor pressure of ethanol is 100. mmHg at 34.9°C. What is its vapor pressure at 53.5°C. (?Hvap for ethanol is 39.3 kJ/mol.) _____ mmHg
The hydration of carbon dioxide (add water to CO2) produces carbonic acid and is part of the equilibrium that controls carbon dioxide levels in the blood during respiration of vertebrate organisms.
A 9.20-L container holds a mixture of two gases at 47 °C. The partial pressures of gas A and gas B, respectively, are 0.315 atm and 0.803 atm. If 0.180 mol of a third gas is added with no cha
Write a balanced equation for the reaction that occurs when hydrogen sulfate ion behaves as a Brønsted-Lowry acid in water.
Is a 0.15M solution of potassium benzoate C6H5COO-K+ acidic, basic, or neutral? Calculate the pH. The Kb for benzoic acid is 1.5 X 10^-10.
Calculate the pH of the 0.20 M NH/0.26 M NHCl buffer. What is the pH after the addition of 20.0 mL of 0.050 M NaOH to 90.0 mL of the buffer solution
What is the balanced chemical equation for the complete combustion of benzoic acid, C6H5CO2H, to form carbon dioxide and water
Hsolution for neutralization of HCl(aq) and NaOH(aq): Volume of HCl: 0.050 L Volume of NaOH: 0.050 L Volume total: 0.10 L Molarity of HCl: 1.99 M Molarity of NaOH: 1.99 M ?T for reaction B: 12°C
List the following in decreasing order of strength (from strongest to weakest): hypochlorous acid, choric acid, perchloric acid, chlorous acid. Explain what trend in these oxoacids is making them pr
A student is asked to prepare a buffer solution at pH = 8.60, using one of the following weak acids: HA (Ka = 2.7 X 10^-3) HB (Ka= 4.4X10^-6) and HC (Ka = 2.6 X 10^-9). Which acid should she choose?
Example on how to make up a buffer: A student has 100 mL of 0.1 M acetic acid and has plenty of 0.1 M sodium acetate and wants to make up a buffer with pH = 5.1.
2 students are titrating and started the titration at 30.0 mL. The buret was at 49.50 mL and the solution still had not chnaged to the base color. They stopped, now at 49.80 mL and refilled the bure
If a solution contains 0.01M Ca^2+, 0.01 M Zn^2+, and 0.01 M Ni^2+ ions and you want to separate them using aqueous (NH4)2C2O2, which ion will precipitate first as an ozalate, CaC2O4, ZnC2O4, or NiC
Calculate for the process ?G°, ?H°, ?S°, and DCp at 36.8oC (the ‘°' refers to the reference temperature of 36.8°C). Attach all work and a well labeled van't Hoff plot and e
Determine the following characteristics of the titration curve for 25.0 mL of 0.400 M NH3(aq) titrated with 0.335 M HI(aq). (For NH3, Kb = 1.8x10-5.)
Calculate the wavelength in nm: a) a muon (a subatomic particle with a mass of 1.884 x 10^-25 g) traveling at 345 m/s b) an electron (me = 9.10939 x 10^-28 g) moving at 3.80 x 10^6 m/s in an electro
If a solution contains 0.01 M Ca^2+, 0.01 M Zn^2+, and 0.01M Ni^2+ ions and you want to separate them using aqueous (NH4)2C2O2, which ion will precipitate first as an oxalate, CaC2O4, ZnC2O4, or NiC