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What would be the saturation concentration (mole/L) of oxygen (O2) in a river in winter when the air temperature is 0°C if the Henry's law constant at this temperature is 2.28 × 10-3 mole/
What volume of the 1 M Tris solution and what mass of (dry) naCl are needed to prepare 40 mL of a solution that is 20 mM Tris and 200 mM NaCl?
Find the appropriate ionization energis the handbook of chemistry and physics and calculate the U elec for Na. ignore the bond energy and compute U elec for NaH (g).
A block which weighs 50.0g is put in Bromoform. Bromoform's density = 2.890 g/cm^3. Assume that the block is 40.0% submerged. What is the density of the block?
A 0.75L bottle is cleaned, dried, and closed in a room where the air is 22 degree Celsius and 44% relative humidity (that is, the water vapor in the air is 0.44 of the equilibrium vapor pressure at
How much energy would be required to ionize 5.18 mg of Na(g) atoms to Na+(g) ions? The first ionization energy of Na atoms is 496 kJ/mol.
5.30 mL of 1,8-nonadiene (d=0.74 g/mL) allowed to react with 5.25 g of hydrogen bromide gas. Two possible products can be formed. Draw the overall rxn including the structures of these two products.
How would your calculated value for the molecular weight of your unknown been affected (high, low, no effect) if a small quantity of the unknown stuck to the metal stirring rod and failed to dissolv
Derieve an expression for the compression factor Z of a gas that obeys the equation of state p(V-nb)=nRT where b and R are constants. If the pressure and temperature are such that Vm=10b, what is t
How many seconds are there in a solar year (365.24 days), expresses in the correct number of significant figures. 60 sec. Per min, 60 min per hr, and 24 hours per day.
The kinetic model of gases assumes the average nearest distances between 2 molecule in the gas is much greater than the size of the individual molecules making up the gas.
How many mL of concentrated HCl would be necessary to prepare 50.0ml of a 10.0 % HCl solution? Concentration HCl acid is listed as 38.0% w/w. What is the other 62.0% of the concentrated HCl solution?
Calculate how many grams of glucose would be required to prepare 400 ml of a 0.36M solution. MW= 180.You have 100X stock of a buffer. You need 100 mL of 1X buffer. How much buffer solution do you use?
Lactic acid, CH3CH(OH)COOH, has a Ka value of 1.4x10-4. How many grams of lactic acid must be added to make 197.0 mL of solution with a pH of 2.17?
When determining the melting point of your pure benzophenone, some of the molten material had solidified high on the thermometer and wire stirrer.
Rotation about the bond between the middle carbon of propane and either terminal carbon gives a series of staggered and eclipsed conformations. Calculate the torsional strain energy of a single H/C
Hydrogen gas is collected over water at 24 degrees celcius. The total pressure of the sample is 755 millimeters of mercury. At 24 degrees celcius, the vapor pressure of water is 22 millimeters of me
As a result of a chemical spill, benzene is evaporating at the rate of 1 gram per minute into a room that is 6 m * 6 m * 3 m in size and has a ventilation of 10 m3/min.
What is the neutralizing power of one dose of baking soda? One dose is 1/2 teaspoon of baking soda dissolved in 4fl oz of water.Use 0.71 g/mL as the density of granular baking soda. 1teaspoon = 4.93
A sample of propane (c3h8) is placed in a closed vessel together with an amount of O2 that is 2.50 times the amount needed to completely oxidize the propane to CO2 and h20 at constant temperature.
Gold can be hammered into extremely thin sheets called gold leaf. If a 208-mg piece of gold (density = 19.32 g/cm3) is hammered into a sheet measuring 2.4 multiplied by 1.0 ft, what is the average t
Calculate the mass of oxygen dissolved in a 70.0 L aquarium maintained at room temperature. the total pressure is 760mmHg and the mole fraction of oxygen in air is 0.209
A mass of 50.0 g of water at 373 K flows into 120. g of water at 300. K and 1 atmosphere. Calculate the final temperature of the system once equilibrium has been reached.
At standard temperature and pressure, what volume of oxygen would be required to be required to burn 2000 g of propane? If air is 21 percent oxygen, what volume of air at STP would be required?
5.00mL of such solution is pipetted into a clean 100.00mL flask and diluted with water to the mark. What's the concentration of this solution?