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Calculate the molarity of the hydroxide ions in a solution that has been prepared by dissolving 70.3 g of barium hydroxide (Ba(OH)2) in water and diluting the solution to a final volume of 4.00 L.
A 1.5-kg specimen of a 88wt% Pb-12wt% Sn alloy is heated to 220°C; at this temperature it is entirely an α-phase solid solution. To what temperature must the specimen be heated?
You weigh out 50mg of benzoic acid and dissolve it in 1mL of diethyl ether. This is then extracted with 1mL of water. The ether layer is removed, dried with sodium sulfate and the ether evaporated y
You determine the temperature mixed solutions to be 45 degrees Celsius. What is the heat capacity of the calorimeter?
What volumetric airflow rate (Qa) is required to maintain a G value of 500s-1 in a basin that is 2.75 m deep and provides a liquid detention time of 5 min? Perform the exercise for water temperature
Sodium atoms emit light with a wavelength of 330 nm when an electron moves from a 4 p orbital to a 3 s orbital. What is the energy difference between the orbitals in kilojoules per mole?
In a calibration experiment, a 0.98 millimole sample of Na2CO3 gave 0.81 millimoles of CO2 gas. If a 0.342 g of pure Na2CO3 was reacted with excess acid, what volume of gas will be measured on this
Determine if the following reactions will form a precipitate when solutions of the reactants are mixed. If a precipitate is formed when the reactants are mixed, write the balanced formula unit.
Methane gas, CH4, effuses through a barrier at a rate of 0.568 mL/minute. If an unknown gas effuses through the same barrier at a rate of 0.343 mL/minute, what is the molar mass of the gas?
Calculate the enthalpy change, Delta H, for this reaction per mole of X. Assume that the specific heat and density of the resulting solution are equal to those of water.
After some argon has been used, the pressure is 2.00 MPa at a temperature of 19 degrees Celcius. What mass (g) or argon remains in the cylinder.
Atmospheric pressure at sea level is 1 atm due to the one square meter column of air extend- ing from the Earth's surface beyond the outer atmosphere. This column weighs approxi- mately 10,000 kg. G
Explain why an aqueous solution of monosodium phosphate would be ineffective for extracting benzoic acid (5) from a diethyl ether solution.
Calculate the molar mass of the noble gas krypton in a natural sample, which is 0.84% 78 Kr (molar mass 77.92 g/mol), 2.2% 80 Kr (molar mass 79.91 g/mol).
The vapor pressure of water at 30C is 31.8 mmHg. What is the vapor pressure (mmHg) of an solution of 396 g sucrose in 620 g water? (MW sucrose=342)
If we begin with an initial SO2Cl2 pressure of 450 torr, what is pressure of substance after 60? At what time will the pressure of SO2CL2 decline to one-tenth its initial value?
A metal-plating waste contains 20mg/L Cu2+, and it is desired to add Ca(OH)2 to precipitate all but 0.5mg/L of the copper. To what concentration in moles per liter must the hydroxide concentration b
At a certain temperature and pressure 0.70 L of H2 reacts with 0.70 L of I2. If all the H2 and I2 are consumed, what volume of HI, at the same temperature and pressure, will be produced?
If hexane is mixed with water, there is a separation of the two solvents into two layers. Why did this separation occur? which solvent would be on top?
Gold metal can be reduced from the compound gold sulfide by hydrogen gas. How many grams of Au can be produced from 500.20g of Au2S3 and 5.67g H2?
How many carbon dioxide in kilograms is produced upon the complete combustion of 18.9 L of propane (approximate contents of one 5-gal tank)? Assume that the density of the liquid propane in the tank
Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in °C?
A sample of 0.6760 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated in excess Na2SO4. If the mass of BaSO4 precipitate that forms is 0.4105 g. What is the per
How many hydrogen sulfide molecules would be required to reach the lethal dose in a room that is 77 feet long, 62 feet wide and 50. feet tall at 1.0 atm and 25.0 oC?