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An unknown liquid sample is analyzed using paper chromatography using solvent X as the mobile phase. One spot is observed after the plate is developed and visualized. The same unknown substance is re-analyzed using solvent Y as the mobile phase. This time, three spots are observed after the plate is developed and visualized.
An optically active D-aldopentose produced on optically inactive alditol upon treatment with NaBH4. When this aldopentose was subjected to a Ruff degradation, a D-aldotetrose was generated.
A coffee-cup calorimeter contains 150.0g of water at 25.1C. A 121g block of copper metal is heated to 100.4C by putting it in a beaker of boiling water.
calculate the amount of energy needed in calories to heat 145 g of water from 22.3 degrees celsius to 75.0 degrees
2 Al2O3(s) → 4 Al(s) + 3 O2(g) . ?H = +3339.6 kJ/mol What is ?H for the formation of one mole of Al2O3(s) from the elements?
If a sample of 6.022 g of CH4 is enclosed in a 30 L container at 402 K. What is its pressure in atmospheres?The volume is reduced to 12 L at constant temperature. What is the new pressure in atmospheres.
a 270- flask contains pure helium at a pressure of 761 . a second flask with a volume of 455 contains pure argon at a
A sample of neon has a volume of 470 mL when it is at a pressure of 685 mmHg. What will be the volume when the pressure is increased to 1212 mmHg?
One of the emission spectral lines for Be3+ has a wavelength of 253.4 nm for an electronic transmission that begins in the state with n = 5
Determine the [OH-] of a solution that is 0.230 M in HCO3-. Also determine the pH of this solution.
Consider one mole of a monatomic ideal gas at 300 K that undergoes a free expansion from a volume of 1 m^3 to 10 m^3. a) How much does the chemical potential of each molecule in a gas change?
if 2.0 g of helium gas and 5.46 g of oxygen gas are mixed togeher, what is the mole fraction of helium in the solution?
The freezing point of ethanol (C2H5OH) is -114.6 degrees Celcuus. The molal freezing point depression constant for ethanol is 2.00 Celcius/m. What is the freezing point (celcius) of a solution prepared by dissolving 50.0 g of glycerin
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