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A 4.50-g sample of LiCl at 25.0C dissovles in 25.0mL of water also at 25.0C. Th final equilibrium temerpature of the resulting solution is 60.8C. what is the enthalpy of solution, delta Hs, of LiCl
A 25.0 ml sample of 0.35M HCOOH (Ka=1.77x10-4) is titrated with 0.20 M KOH. What is the pH of the solution after 25.0 ml of KOH has been added to the acid?
A 27.2 mL sample of a solution of RbOH is neutralized by 16.12 mL of a 2.047 M solution of HBr. What is the molarity of the RbOH solution? Answer in units of M.
Treatment of 2-ethyl-1-butene with H3O+/H2O leads to three dimerization products of the formula C12H24. Please help me draw all three structures.
Calculate the masses of the solid you must measure out to prepare 100mL EACH OF 0.025 M KNO3 , 0.025 M CuSO4, 0.025 M Ca(NO3)2, and 0.025 M KCl . include waters of hydration when clculating the for
What volume will 300 ml of gas at 40 degrees celcius and a pressure of 720 mm hg occupy if the temperature is reduced to -150 degrees celcius and the pressure increased to 1380 mm hg?
The volume of an ideal gas is held constant. Determine the ratio P2/P1 of the final pressure to the initial pressure when the temperature of the gas rises (a) from 35.0 to 70.0 K and (b) from 35.0 t
A 91 gram solution of silver nitrate contains 15 grams of AgNO3. What is the percent by mass of silver nitrate in this solution? Answer in units of %.
In an equilibrium mixture the partial pressures of SO2 and O2 are 0.165 atm and 0.755 atm, respectively. What is the equilibrium partial pressure of SO3 in the mixture?
Approximately how many grams of monosodium succinate (FW = 140 g/mol; succinic acid pK2=5.64) and disodium succinate (FW = 162 g/mol) must be added to 1L of water to produce a solution with a pH 5.2
The two containers are opened and the temperature of each substance is measured. the aluminum has cooled to 35 degree Celsius while the water has cooled only to 66 degree Celsius. Explain this diffe
Calculate the value of Delta S when 1.90 mol of {rm{CH}}_3 {rm{OH}}(l) is vaporized at 64.7 ^circ {rm C}.
a cetrain pitchers fastballs have been clocked at 104 mph. Calculate the wavelength of a .141-kg baseball(in nm) traveling at this speed.
A solution of ammonia and water contains 1.10×1025 water molecules and 5.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
If a blue light has a wavelength of 5.50 x 10-7 (550 nanometers), what is the frequency of the light?
The rate constant of a reaction is 4.7 multiplied by 10-3 s-1 at 25°C, and the activation energy is 33.6 kJ/mol. What is the value of k at 75°C?
If 32 mL of 6.8 H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?
A 2.40-g sample of a large biomolecule was dissolved in 13.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec
If a 2 m telescope is observing a wavelength of 600 nm, what is the smallest resolvable angle in arc seconds?
Calculate the density of a solid cube that measures 4.79 cm on each side and has a mass of 420
A 2.5-L sample of a 6.3M NACl solution is diluted to 75L. What is the molarity of the diluted solution?
Determine the emf of a fuel cell that oxidizes hydrogen according to the reaction:
Calculate the molality and molarity of an NH3 solution made up of 37.0 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
Consider 25.0 g of water at 21.7°C that are mixed with 25.0 g of water at 43.3°C in a foam cup calorimeter. The equilibrium temperature reached was 30.4°C. Calculate the calorimeter con
A sample of H½O with a mass of 46.0 grams has a temperature of -58.0 àC. How many joules of energy are necessary to melt 46.0 grams of ice? (Use 2.1 J/gàC for the specific heat of