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Calculate the hydroxide ion concentration in a solution that is 0.068 M morphine C17H19O3N and 0.045 M morphine hydrochloride C17H20O3NCl. Kb of C17H19O3N is 1.6 x 10^-6
A 4.0L sample of air collected at 298 K and then cooled to 278F while held at constant pressure. What is the new volume of the air
A mixture of 2.00 moles of H2, 3.00 moles of MH3, 4.00 moles of CO2, and 5.00 moles of N2 exert a total pressure of 350kPa. What is the partial pressure of each gas?
How could you be certain a peak in the soda was caffeine and not another substance with similar retention time
Draw the hydrogen on the chiral center. Make sure you indicate the chiral center through stereo wedges (as in the following example), and that there are no other bonds between the two bonds drawn with the stereo wedges.
Suppose that the observed melting point range of a solid was originally 150-160 °C, but this became 145-145.5 °C after recrystallization. How might you account for this observation
Hexane has a density of 0.659 g/mL. How many milliliters would a student need to pour in order to get 49.5 g of hexane?
You have prepared a saturated solution of X at 20 degress Celsius using 27.0g of water. How much more solute can be dissolved if the temperature is increased to 30 degress Celsius
A powder contains FeSO4·7H2O (molar mass = 278.01 g/mol) among other components. A 3.585-g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe3
A proton in a linear accelerator has a de Broglie wavelength of 138 pm. what is the speed of the proton?
Calculate w (in kJ) when 538 g iron (III) oxide (MM = 159.7 g/mol) reacts with excess carbon to produce carbon dioxide gas at 479 K: 2Fe2O3(s) + 3C(s) ? 4Fe(s) + 3CO2(g)
the diameter of a carbon atom is 1.54 A. (a) express this diameter in picometers. (b) how many carbon atoms could be aligned side byside across the width of a pencil lime that is 0.20 mm wide
Evaluate the energy of an electron excited from a hydrogen atom using Bohr's model. Determine the maximum wavelength of energy needed to observe a photoelectric effect for potassium.
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