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compute the number of electrons in a flake of pure gold valued at 015 assume that the price of gold is 17620troy oz 1
a sample of 13 g of nitrogen can be combined with 14857143 g of oxygen to form nitric oxide gas no what mass of oxygen
if a hydrogen-like atom in the ground-state is excited with a wavelength of 39721nm how much energy has been absorbed
what volume of glacial aceic acid 18m and what weight of sodium acetate trihyddratech3coona3h20 are required to make
what is the molarity of the concentration hcl concentrated hcl is 372 by mass how did you find this value using the
what is the molarity of a 50 by mass naoh how did you find this value using this molarity show that 13ml of 50 by mass
you wish to prepare a 05 liter solution of an acetate buffer having a ph of 50 and a concentration of 1m the pka of
what weight of solid glycine pk124 and pk296 and what volume of 10 m hcl are required to make 100ml of 3 m buffer ph 24
describe the preparation of one liter of 010 m ammonium cholride buffer ph9 starting with solid ammonium cholride pk926
chlorine has two stable isotopes 35cl and 37cl if a sample of chlorine has an average molar mass of 36127139 gmol what
a mass of 1 kg of r-134a is contained in a rigid glass vessel of volume v 005 m3 the system is initially at t1 30ca
an experimenter has determined the relative abundance fractional abundance of the five naturally occurring isotopes of
a compound is produced when 608g of nitrogen combine completely with 1392 g oxygen what is this
100ml of a 04 moll acetic acid is mixed with 20ml of a 18 moll naoh calculate the ph of this buffer pka acetic acid
element z has two natural isotopes z-79 78918 amu and z-81 80916 amu calculate the atomic mass of element z given the
a 1000 ml aliquot of a dibasic compound with kb1 110-4 and kb2 110-8 was titrated with 100 m hcl and a base
a 01510 gram sample of hydrocarbon produces 05008 gram co2 and 0128 gram h2o in combustion analysis its molecular
isooctane is a standard for gasoline octane rating a sample weighing 5992 g was found to contain 5040 g of carbon and
in the isothermal reversible compression of 520 mmol of an ideal gas at 260 k the volume of the gas is reduced from 300
how man protonsneutrons and electrons are there in the neutral atom of the isotope of silver named
calculate the vapor pressure of water above a solution prepared by dissolving 350 g of glycerin c3h8o3 in 140 g of
exactly 7500ml of a solution that contained 4804ppm of bano32 were mixed with 2000ml of a solution that was 003090 m in
water is flowing in a horizontal pipe 1 inch schedule 40 with a velocity of 2 fts and a pressure of 10 psia the water
what is the relationship between energy and the wavelength of an electromagnetic