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Which of the following indicators would be the best to use when 0.050 M benzoic acid (Ka = 6.6 *10^-5) is titrated with .05 M NaOH?
A) bromphenol blue, pH range: 3.0-4.5B) bromcresol green, pH range: 3.8-5.4C) alizarin, pH range: 5.7-7.2D) phenol red, pH range: 6.9- 8.2
the standard molar enthalpy of vaporization for water is 40.79 kjmol. what mass of steam is required to release 500. kj
Calculate the wavelength of a photon emitted when 1x10^-27 g particle in a box of a length 6.0 Angstrom goes from n=5
A gaseous mixture of O2 and Kr has a density of 1.111 g/L at 420. torr and 300. K. What is the mole percent O2 in the mixture?
assume ideal gas behavior.nbsp sns 2 haq rarr sn2aq h2gnbspcompute the work done when 55.0 grams of tin mixes in
how much energy is needed to heat 24.8g water from 64 degrees to 123 degrees celsius?
calculate the moles of CO2 you would theoretically expect from 0.253 grams of an alka-seltzer tablet at 721. torr and 291. K.
what volume of 420 ml of hydrogen occupy if the temperature is raised from 0 C to 95 C?
what is the minimum number of photons you would need to interact with these atoms in order to have all of their electrons promoted to the n = 3 level? What wavelength of light would you need to perform this experiment
why during a GC is the boiling point for some samples higher than the final temperature used during the run yet these samples still run
a piece of metal with a mass of 151 g is placed in a 50 ml graduated cylinder. the water level rises from 20. ml to 35
A sample of helium effuses through a porous container 6.5 times faster than does unknown gas X?
When we go down a group, electron affinity should become more positive (less energy released), since the electron is added at increasing distances from the nucleus.
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