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A mixture of helium as well as neon gases at 243 K contains three times the number of helium atoms as neon atoms. The concentration (n/V) of the mixture is determined to be 0.150 mol/L. Presume ideal behavior what is the partial pressure of helium?
A 0.7995 g sample of a compound containing only uranium and chloride is dissolved in water and excess aqueous silver nitrate is added to precipitate 0.9982 g of silver chloride . Calculate the empirical formula of the compound.
Molecule X has an absorbance of 0.287 at 247nm when a 7.67 x 10^-5 M solution is measured in a 2.25 cm cell. What is the molar absorptivity of X
A 1L steel tank is fitted with a safety valve that opens if the internal pressure exceeds 850 torr. It is filled with helium at 23 oC and 0.991 atm and placed in an oil bath.
liquid nitrogen has a density of 0.808 gml and boils at 77 k. researchers often purchase liquid nitrogen in insulated
Cesium-131 is a short lived radioisotope (t1/2= 9.7 days) used to treat prostate cancer. How much theraputic strength does a Cesium-131 source lose over 60 days? Express your answer as a percent of the strength the source had at the begining of th..
what is the difference between cholesterol and
A green leaf has a surface area of 2.00 cm^2. If solar radiation is 1030 W/m^2, how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 nm for solar radiation.
the mass spectrum of a hypothetical element shows that 86.19 of the atoms have a mass of 27.977 u 0.825 have a mass of
why is the h-f bond so much stronger than the h-I bond? how might you tell whether or not your toother paste conatied calcium carbonate caco3, or perhaps baking soda with out looking at the label?
Using the periodic table, arrange the atoms in each of the following sets in order of increasing electronegativity: a) CL, F, Br; b) B, O, N; c) Mg, F, S
a calorimeter contains 29.0 grams of waterh2o at 11.5 degree celsius temperature . when 1.90 grams of a substance with
Assume the radius of a neutron to be approximately 1.0; times ;10^{ - 13} {rm cm}, and calculate the density of a neutron.
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