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you have two solutions of the same molar concentrations one contains lactic acid the other sodium lactate you want to
calculate the ppm salt nacl in a 5000 ml sample of an unknown brine titrated with 3764 ml of 01024 m silver nitrate
the formula for rust can be represented by fe2o3 how many moles of fe are present in 100 g of the
how many moles of o are needed to combine with 0289 mole of c to form the following compounds co and
calculate the initial concentration of iodide ion after the solutions in tubes a and b are mixed before the reaction
a mixture of methane and air has capability of being ignited if mole percent of methane is between 5 and 15 a mixture
a 02m citrate buffer ph 50 was prepared using citric acid h3a and sodium citrate na3a what are the concentrations of
some 2-methyl-2-butene may be produce in the reaction as a by-product give a mechanism for its
aluminum foil used to storing food weighs about 005gcm2 how many atoms of aluminum are contained in one squared inch of
a student is required to prepare 250 ml of ethanol using a sucrose fermentation technique how many ml of carbon dioxide
how many milliliters of a 0150 m sucrose solution will be needed to perform an experiment in which 3669 g of sucrose is
40-year-old manager at a prominent legal firm in la experiences abdominal pain post lunch he goes to the restroom a
two students determine the percentage of lead in a sample as a laboratory exercise the true percentage is 2252 the
what is the effect of an insoluble impurity such as sodium sulfate on the observed melting point of a
a 2l jar equipped with a tight-fitting lid that contains a rubber septum is half filled with water at equillibrium the
a water storage tank in a distribution system is filled at a rate of 300 m3h the chlorine concentration of the water
calculate the wavelength of a photon emitted when the electron in a li2 ion relaxes from the n6 energy level to the n4
while enjoying a fireworks display you observe a flash of light followed after a brief delay by the corresponding sound
a hydrogen atom initially in the n11 quantum state emits a photon having a wavelength of 287144e-6 m what is the
calculate the number of photons emitted in one second by a 13 w laser operating at a wavelength of 4000 nm
calculate the de broglie wavelength of a helium atom moving at a speed of 2440
in two-photon ionization spectroscopy the combined energy of two different photons is used to remove an electron from
if the uncertainty in velocity of an electron is 8000 ms what is the minimum uncertainty in its
2450 nm ultraviolet light strikes a metal plate and ejects electrons having kinetic energy e 179 ev calculate the
if the work function of a metal is 449 ev what is the maximum wavelength of light that can be used to observe the