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What fators are generally responsible for the variaion in the base strength of nitrogen bases?
Calculate the change in enthalpy and entropy of 50g of liquid water starting at 10 degrees Celsius and completely evaporating into H2O gas at 100 C.
A colored substance Z has an absorption maximum at 350 nm. A solution containing 2 mg of Z per liter had an absorbance of 0.850 using a 1 cm cell. The formula weight of Z is 148.
Two full bottles contain respectively 1.0 kg of potassium nitrate, KNO3, and 1.0 kg of strontium chloride, SrCl2. Which bottle contains the greater number of moles? How many more moles does it cont
What is the purpose of such an addition? What is the procedure called? Why is the procedure used in this experiment called liquid-liquid extraction?
what are the H3O+ and OH- concentrarions in a 125 mL solution prepared with 0.100 mol pf NaOH and water?
A certain first-order reactio has a rate constant of 3.60×10-3 at 45 . How many minutes does it take for the concentration of the reactant to drop to 6.25% of the original concentration?
Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr
Assume that a reaction takes place at 295 K and 305 K. What must the activation energy be for the rate constant to double as described?
A gas occupying a volume of 810. mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
The dry ice is allowed to sublime and the mixture is allowed to return to 25.0 degrees Celsius. what is the total pressure in the flask?
If the molar mass of the hydrocarbon is 126.3 g/mol, what is the molecular formula of the hydrocarbon
The decomposition of N2O to N2 and O2 is a first order reaction. At 730 degrees Celcius the half-life of the reaction is 3.58x10^3 min. If the initioal pressure of N2O is 2.10 atm at 730 degrees Cel
A sample of oxygen gas is collected over water at 25 degrees C and a total pressure of 637 torr. The volume of the gas collected is 500.0 mL. What mass of oxygen is collected? The vapor pressure of
Sodium carbonate (rm Na_2CO_3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be added to neutralize 6.05×103 kg of sulfuric acid solution?
Of the solvents used, some were very polar (e.g., acetone, ethanol) while others were very nonpolar (e.g., hexane). Did the polarity of the various solvent mixtures seem to affect the completeness
What is analytic chemistry? What is analytic chemistry?
How many grams of CH3OH must be added to water to prepare 150mL of a solution that is 2.0 M CH3OH?
A solution is prepared by dissolving 25.0 g of ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.0 mL sample of this stock solution is added to50.0 mL of water. Calculate the
Draw a dot and cross diagram to show the bonding in CH2F2. Your diagram only needs to show the outer shell electrons.
A solution of malonic acid, H2C3H2O4 was standardized by titration w.1000M NaOH solution. If 20.76 mL of the NaOH solution were required to neutralize completely 13.15 mL of the malonic acid solutio
The formation constant of the complex ion Cu(CN)32- is 1.0 × 109. What is the copper(I) ion concentration in this system at equilibrium?
Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas. If 927 mL of hydrogen gas is collected by displacement of water at 740.0 mm Hg and 20. °C, what mass of Al w
Describe the soil and site characteristics of soilderived from older fresh water sediments as one of the six soil classes in the Caribbean. 150-200 word limit