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The solid and toluene together weigh 58.88 g. The density of toluene at the temperature of the experiment is 0.864 {g/mL}. What is the density of the solid?
An element has three naturally occurring isotopes with the following masses and abundances (in parenthesis): 27.977 amu (0.9222); 28.974 amu (0.0469); 29.974 amu (0.0310).
What is the volume of 235 mL of a sample of gas at 53.0°C and 740. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
A solution of ammonia and water contains 1.60×1025 water molecules and 7.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
A gas sample has an original volume of 700 ml when collected at 750 mm and 25°C. What will be the volume of the gas sample if the pressure increases to 810 mm and the temperature increases to 3
The ground water in Pherric, New Mexico contains 1.80 mg/L of iron as Fe+3. What pH is required to precipitate all but 0.30 mg/L of the iron as Fe(OH)3 at 25oC?
What is the volume of 340. mL of a sample of gas at 55.0°C and 740. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
Write the balanced net ionic equation for the reaction that occurs when 0.1 M solutions of copper(II) sulfate and calcium perchlorate are mixed.
Calculate the molar concentration of a solution prepared by dissolving 5.4 g of sodium sulfate (MW = 142) in enough water to make 500 ml of solution ?
A gas made up of atoms escapes through a pinhole 0.552 times as fast as Ar gas. Write the chemical formula of the gas.
The final equilibrium temperature of the resulting solution is 60.8°C . What is the enthalpy of solution of LiCl expressed in kilojoules per mole ?
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.