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Elemental iodine (I2) is a solid at room temperature. What is the major attractive force that exists among different I2 molecules in the solid?
air at 400kpa 970 k enters a turbine operating at steady state and exits at 100 kpa 670 k. heat transfer from the
A sample of urea contains 1.009 g N, 0.145 g H, 0.432 g C, and 0.576 g O. What is the empirical formula of urea?
How could you be certain a peak in the soda was caffeine and not another substance with similar retention time
a hurricane is simply a steam engine which draws much of its destructive power from the evaporation and condensation of
what is the composition of vapor of a pentane-hexane solution that has a vapor pressure of 373 torr at 25 degree celcius? Given is Pure Hexanes and pentanes vapor pressure at 25 degrees celcius. Pentane - 511 torr. Hexane -150 torr.
Assume an organic compund has a partition coefficient between water and diethyl ether equal to 7.65. If there are initially 8.01 grams of the compound dissolved in 90.0mL of the water
A sample of helium has a volume of 3 liters when the pressure is 500 torr. What volume does the gas occupy at 300 torr?
For an enzyme assay you require a 50 mM Tris-HCl buffer, pH 7.8. How many grams of Tris (mw = 121, pKA = 8.1) and how any ml of 2 M HCl would you require to make 1 L of this buffer
a system at equilibrium or striving to reach equilibrium responds in a way that best ac- commodates or reduces any
Briefly explain how a lake with a limestone bed is more resistant to pH changes than a lake with a granite bed
The pH of human muscle fluids is 6.8. Calculate the value of H3O+ in muscle fluid at 25 degrees Celcius. The answer should be in scientific notation.
When titrating 0.15 M HCl with a calcium hydroxide solution of unknown concentration, 35 mL of acid are required to neutralize 25 mL of the base.
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