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Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.508g/L at 25C and 721mmHg?
What would the pH of a raindrop be if the concentration of CO2 increases to 600 ppm at 20 degrees C? Show all steps.
Determine the pH of (a) a 0.20 M NH3 solution, (b) a solution that is 0.20 M in NH3 and 0.30 M NH4Cl
Calculate the volume of concentrated reagent required to prepare the diluted solutions indicated.
An environmental chemist sampling industrial exhaust gases from a coal-burning plant collects a CO2-SO2-H2O mixture in a 21-L steel tank until the pressure reaches 850 torr at 45oC.
Solid lithium hydroxide is used in space vehicles to remove the carbon dioxide gas exhaled by astronauts. The hydroxide reacts with the carbon dioxide to form solid lithium carbonate and liquid water.
Sorbic acid, CH2CHCHCHCH2CO2H (pKa= 4.77), is widely used in the food industry as a preservative. For example, its potassium salt (potassium sorbate) is added to cheese to inhibit the formation of mold. What is the pH of the 0.37 M potassium sorba..
What is the ppm concentration? The molar extinction coefficienet is 87,000 M-1cm-1 and the molecular weight is 407.98 g/mol. The density of water is 1.00 g/mL
Draw all the alkenyl side products that could be formed by dehydration of 2-methyl-2-butanol by e1 mechanism. Propose mechanism for formation of the alkene side products
Write the chemical equation and the Kb expression for the reaction of each of the following bases with water: ammonia, NH3; hydrogen sulfide, HS- ; hypochlorite ion, ClO-
Suppose you had samples of 1-bromo-3-methylbutane and 2-bromo-2-methyl butane. Choose reaction conditions that will enhance the rate of substitution and decrease the rate of elimination for each.
What is the concentration of the HNO3 solution? (b) How many moles of NaOH were in excess after the first addition?
At 25 C the decomposition of dinitrogen tetra oxide N2O4(g) 2NO2(g) has an equilibrium constant Kp of .144. At Equlibrium, the total pressure of the system is .0758 atm. What is the partial pressure of each gas
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