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a molecular compound contains 923 carbon and 77 hydrogen by weight if 0152 mol of the compound weighs 395 g what is its
a massless spring of spring constant 50 nm is suspended vertically set the vertical origin to the natural length of the
a 500-g sample of a material at 800 degree c is dropped into a calorimeter containing 1000g of water at 200 degree c
initially a mixture contains 0629 mol each of n2 and o2 in an 664-l vessel find the composition of the mixture when
a thin film of acetone n 125 coats a thick glass plate n 152 white light is incident normal to the film in the
what mass of ammonium chloride should be added to 265 l of a 0165 m nh3 in order to obtain a buffer with a ph of
if 88 mg of iodine-123 is used in an experiment how many milligrams of iodine-123 should remain after 50 hours assume
a 40 kg child stands on the edge of a rotating merry-go-round with a radius of 2m the moment of inertia of the
a woman on a rocket traveling at 072c with respect to earth observes a meteor come from in front of her and pass her at
gaseous oxygen is held in two separate containers at identical temperature and pressure the volume of container a is
in chem122 we do an experiment where the charge of an electron may be determined in this experiment a current of 03
infrared light of wavelength 25 illuminates a 020-mm-diameter hole what is the angle of the first dark fringe in rad in
a 200 ml sample of hypobromous acid hbro was titrated with 0180 m koh to reach the equivalence point required 2775 ml
the ksp for aloh3 is 1910-33 what is the ph of a sauturated solution of aloh3 ignore any
a violinist is tuning the a string on her violin by listening for beats when this note is played simultaneously with a
the initial temperature of a 344 g sample of iron is 182 deg c if the sample absorbs 225 kjof energy as heat what is
a calculate the h3o of a solution that has an oh of 0000 0060m is the solution acidic basic or neutralb calculate the
a solution was prepared by dissolving 0450 g mgso4 fw120363gmol in 0500l of water a 500 ml aliquot of this solution
if the rectangular barge is 350m by 240m and sits 0900m deep in the harbor how deep will it sit in the
a 020-kg object is oscillating on a spring with a spring constant of k 15 nm what is the potential energy of the
020 moles of helium gas that initially occupies a volume of 40l under a total pressure of 10x105 pa subsequently
an ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge
arsenic acid h3aso4 is a triprotic acid with a ka15e-3 ka28e-8 and ka36e-10 calculate h oh- h3aso4 h2aso4-haso4 2- and
in a qualitative analysis procedure a chemist adds 02 m hcl to anunknown group of ions and then saturates the solution
after carrying out the reaction why does a precipitate solid form when you pour the reaction mixture on