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Suppose that your mixture showed a good TLC separation with methylene chloride, but you inadvertently eluted the column with methanol. What would happen?
Write the expression for Keq of the following reaction:
When the wax melts, the block slides out to the end of the rod. What is the final angular velocity? Give your answer in rpm.
A 135 mL sample of a 15.0 M ethylene glycol (rm C_2H_6O_2) solution is diluted to 1.50 L. What is the freezing point of the final solution? (Assume a density of 1.06 g/mL for the final solution.)
What is the magnitude of the net gravitational force on the mass at the origin due to the other two masses?
How can you improve the overall yield of vanillyl alcohol from the reduction of vanillin?
How many grams of H2O can be cooled from 45 degrees C to 15 degrees C by the evaporation of 63 grams of water. The heat of vaporization is 2.4 KJ/gram and the Specific Heat of water is 4.18 J/gK.
Calculate the initial rate of the NO reduction at 1100 K if 400.00 mg of NO and 600.00 mg of H2 are confined to a 5.00 L reaction vessel.
A dog searching for a bone walks 4.00 m south, then 8.20 m at an angle of 30.0° north of east, and finally 12.0 m west. Use graphical techniques to find the direction of the dog's resultant disp
What is the pH at the equivalence point when 30.0mL of 0.175 mol/L HCOOH is titrated with 0.135 mol/L NaOH? Assume the temperature is 25 degrees celcius. For HCOOH, pKa=3.74 at 25 degrees celcius.
A solution of salt (molar mass 90 g mol -1) in water has a density of 1.29 g/mL. Calculate the mole fraction of the salt in the solution
A space station, in the form of a wheel 105 m in diameter, rotates to provide an "artificial gravity" of 2.50 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of ro
What mass of octane must be burned in order to liberate 5350 kJ of heat? ΔHcomb = -5471 kJ/mol.
A sample of gas occupies a volume of 396 mL at 1.28 atm and 72 oC. Calculate the volume of the gas if its temperature is changed to -31.5 oC while its pressure is held constant.
A horse canters away from its trainer in a straight line, moving 116 m away in 14.0 seconds. it then turns abruptly and gallops halfway back in 4.8 seconds. calculate (a) its average speed and (b) i
If a person ingests 9.00 mL of 14.0mM NaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion?
A 1.50 L mixture of helium, neon, and argon has a total pressure of 1.47 atm at 298K. If the partial pressure of helium is 0.38 atm, and the partial pressure of argon is 0.32 atm, what mass of neon
Calculate the freezing point of a nonionizing antifreeze solution containing 388 g ethylene glycol, c2h6o2 and 409 g of water
What is the tangential acceleration of a bug on the rim of a 12.0 in. diameter disk if the disk moves from rest to an angular speed of 78 revolutions per minute in 4.0 s?
What is the pH after 0.195 mol of NaOH is added to the buffer? Assume no volume change on the addition of the base.
Holding a long rope by its upper end, you lower it onto a scale. The rope has a mass of 0.13 kg per meter of length, and is lowered onto the scale at the constant rate of 1.4 m/s. Calculate the thru
A solution contains 410.3 g of H2SO4 per litre of solution . If the density is 1.243 g/ml, what will be its molarity and molality?
A bacterial culture isolated from sewage produced 35.5 mL of methane, CH4, at 31 oC and 753 mmHg. What is the volume of this methane at STP?
Has the industry made any recent advances in farming that have chemical foundations?
What proportions of ethanol and water should be mixed in order to produce 100 cm3 of a mixture containing 50 percent by mass of ethanol?