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Explain the general principle of chromatography. Please include discussion on retention time, mobile phase, and stationary phase.
Why must the spot applied to a TLC plate be above the level of the developing solvent
formic acid is titrated with 0.50 M sodium hydroxide, calculate the pH before any of the titrant (NaOH solution) is added and after 15.0 mL of the titrant has been added.
If the 300MHz 1H NMR spectrum of a compound has a doublet with one signal at 6.10ppm and the second signal at 6.05 ppm, the value of the coupling constant is?
consider the reactionno o3 rarr no2 o2which has a rate constant given by k 1.8times10-12 e-1370t cm3 molecules-1 s-1
An experiment shows that a 249 -mL gas sample has a mass of 0.433 g at a pressure of 750 mm Hg and a temperature of 29?. What is the molar mass of the gas?
a sample of cadmium with mass 2.248g is dissolved in 3.00M HCl. What volume of HCl is required to dissolve the Cd. (Cd dissolves in HCl to form Cd^2+)
if 5.00g helium gas is added to a 1.00-L ballon cantaining 1.00g of helium gas, what is the new volume of the ballon?
Calculate the mass percent (m/m) for the solute in each of the following solutions: Express the answer using 2 sig figures.
Calculate the threshold wavelength, in nm, of a metal if that metal emits an electron with a kinetic energy of 6.36E-19 J when illuminated with light that has a frequency of 1.97E15 Hz.
zn s 2hcl liq -gt h2 g zncl2 s how many moles of zncl2 form when 6.3 mol of zn
What is the osmotic pressure, in atm, of a solution formed by dissolving 17.8 g of PbCl4 in 0.250 L of water at 64.4 oC? (R = 0.0821 L-atm/mol-K; 0 oC = 273 K)
what is the significance of a limiting reactant. discuss how it is found and what it tells us about the amount of
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