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A single beam photometer with a linear response showed a detector signal of 73.6 uA for a blank solution. Replacing the blank with the sample solution yielded a signal of 24.9 uA. What is the transmittance expected for a sample solution of twice the concentration of the first sample?
In a simplified and example version of the solar system model (developed by Neils Bohr, a Danish chemist), an electron in the first orbit has an energy of 2 J
Explain why the Rf values changed when the eluant was changed from 100% petroleum ether to a 95:5 mixture of petroleum ether-ethyl acetate.
calculate the diameter of the ball. The density of water is ?w = 1.000 g/cm3, the density of styrofoam is ?foam = 0.0950 g/cm3 and the acceleration due to gravity is g = 9.81 m/s2.
Determine the limiting reactant and also calculate how much of the gas is produced?
calculate the mass, in grams, at 25 degrees celcius of 30.0mL of propylene glycol, which has a density of 1.036g/mL
In the preparation of the esters given in this experiment, the reaction product was extracted with 5% sodium bicarbonate solution in the isolation step. Why? What gas was evolved during this washing step? Write a balanced equation for the reaction..
Calculate the vapor pressure of each component, the total pressure, and the composition of the vapor phase when the mole fraction of Br2 is 0.050. Assume that the conditions of an ideal dilute solution are satisfied at this concentration.
What mass of calcium chloride is dissolved in 100. mL of a 1.20 M solution of calcium chloride
A sample of ammonium dichromate contains 2.25 moles of hydrogen atoms. How many moles of oxygen atoms are in the sample
For such systems, it is often observed that the ratio of the vapor pressures of the pure species is nearly constant over a considerable temperature range. Let this ratio be r, and determine the range of values of A, expressed as a function of r, f..
Suppose that 25g of each of the following substances is initially at 27.0 degrees C. What is the final temperature of each substance upon absorbing 2.30kJ of heat
the pH of the two equivalence points and the volume
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